DEFINED BENEFIT PLANS (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
pension_plan
Dec. 31, 2014
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Number of separate pension plans | pension_plan         2  
Change in projected benefit obligation [Roll Forward]            
Projected benefit obligation at end of year $ 47,138,000 $ 47,652,000 $ 48,263,000      
Service cost 0 0 0      
Interest cost 1,914,000 1,996,000 1,914,000      
Actuarial (gain) loss (227,000) (618,000)        
Benefits and expenses paid (2,201,000) (1,989,000)        
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 31,972,000 33,183,000        
Actual return on plan assets 1,060,000 (975,000)        
Employer and participant contributions 647,000 1,753,000        
Benefits and expenses paid (2,201,000) (1,989,000)        
Fair value of plan assets at end of year 31,478,000 31,972,000 33,183,000      
Funded status and financial position:            
Fair value of plan assets 31,972,000 33,183,000 33,183,000 $ 31,478,000 $ 31,972,000 $ 33,183,000
Benefit obligation at end of year $ 47,138,000 $ 47,652,000 $ 48,263,000 47,138,000 47,652,000 $ 48,263,000
Funded status       (15,660,000) (15,680,000)  
Amount recognized in the balance sheet consists of:            
Current liability       (1,753,000) (647,000)  
Noncurrent liability       (13,907,000) (15,033,000)  
Liability recognized in the balance sheet       (15,660,000) (15,680,000)  
Accumulated benefit obligation for the combined plans       47,138,000 47,652,000  
Accumulated Other Comprehensive Loss            
Initial net asset (obligation)       0 0  
Prior service credit (cost)       0 0  
Net loss       18,817,000 19,271,000  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Minimum Pension Liability, before Tax       $ 18,817,000 $ 19,271,000  
Actuarial assumptions            
Discount rate for projected benefit obligation       3.97% 4.18% 3.80%
Discount rate for pension costs 4.18% 4.25% 4.75%      
Expected long-term average return on plan assets 7.00% 7.00% 7.00%      
Net periodic benefit costs            
Service cost $ 0 $ 0 $ 0      
Interest cost 1,914,000 1,996,000 1,914,000      
Expected return on plan assets (2,176,000) (2,309,000) (2,269,000)      
Amortization of loss 1,348,000 1,192,000 491,000      
Net periodic benefit expense $ 1,086,000 $ 879,000 136,000      
Pension assets            
Target Allocation 100.00% 100.00%        
Actual Allocation       100.00% 100.00%  
Weighted Average Expected Long-Term Rate of Return 7.00% 7.00%        
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets $ 31,972,000 $ 33,183,000 33,183,000 $ 31,478,000 $ 31,972,000 $ 33,183,000
Defined Benefit Plan, Contributions by Employer 600,000 1,800,000        
Expected cash contributions (1,753,000)          
Benefit plan payments            
2013       2,252,000    
2014       2,373,000    
2015       2,451,000    
2016       2,565,000    
2017       2,624,000    
2018-2022       14,028,000    
Projected benefit obligation relating to unfunded plan       319,000 323,000  
Supplemental Executive Retirement Plan expense 13,618 15,500 $ 15,000      
Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 31,972,000          
Fair value of plan assets at end of year 31,478,000 31,972,000        
Funded status and financial position:            
Fair value of plan assets 31,972,000 31,972,000   31,478,000 31,972,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 31,972,000 31,972,000   31,478,000 31,972,000  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 14,373,000          
Fair value of plan assets at end of year 14,228,000 14,373,000        
Funded status and financial position:            
Fair value of plan assets 14,373,000 14,373,000   14,228,000 14,373,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 14,373,000 14,373,000   14,228,000 14,373,000  
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 17,599,000          
Fair value of plan assets at end of year 17,250,000 17,599,000        
Funded status and financial position:            
Fair value of plan assets 17,599,000 17,599,000   17,250,000 17,599,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 17,599,000 17,599,000   17,250,000 17,599,000  
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets $ 0 $ 0   $ 0 $ 0  
U.S. Large Cap Funds [Member]            
Pension assets            
Target Allocation 25.00% 25.00%        
Actual Allocation       21.60% 21.50%  
Weighted Average Expected Long-Term Rate of Return 4.20% 2.00%        
U.S. Large Cap Funds [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year $ 6,877,000          
Fair value of plan assets at end of year 6,784,000 $ 6,877,000        
Funded status and financial position:            
Fair value of plan assets 6,877,000 6,877,000   $ 6,784,000 $ 6,877,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 6,877,000 6,877,000   6,784,000 6,877,000  
U.S. Large Cap Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 6,877,000          
Fair value of plan assets at end of year 6,784,000 6,877,000        
Funded status and financial position:            
Fair value of plan assets 6,877,000 6,877,000   6,784,000 6,877,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 6,877,000 6,877,000   6,784,000 6,877,000  
U.S. Large Cap Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
U.S. Large Cap Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets $ 0 $ 0   $ 0 $ 0  
U.S. Mid Cap Funds [Member]            
Pension assets            
Target Allocation 5.00% 5.00%        
Actual Allocation       7.90% 8.10%  
Weighted Average Expected Long-Term Rate of Return 0.70% 0.50%        
U.S. Mid Cap Funds [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year $ 2,604,000          
Fair value of plan assets at end of year 2,477,000 $ 2,604,000        
Funded status and financial position:            
Fair value of plan assets 2,604,000 2,604,000   $ 2,477,000 $ 2,604,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 2,604,000 2,604,000   2,477,000 2,604,000  
U.S. Mid Cap Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 1,357,000          
Fair value of plan assets at end of year 1,226,000 1,357,000        
Funded status and financial position:            
Fair value of plan assets 1,357,000 1,357,000   1,226,000 1,357,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 1,357,000 1,357,000   1,226,000 1,357,000  
U.S. Mid Cap Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 1,247,000          
Fair value of plan assets at end of year 1,251,000 1,247,000        
Funded status and financial position:            
Fair value of plan assets 1,247,000 1,247,000   1,251,000 1,247,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 1,247,000 1,247,000   1,251,000 1,247,000  
U.S. Mid Cap Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets $ 0 $ 0   $ 0 $ 0  
U.S. Small Cap Funds [Member]            
Pension assets            
Target Allocation 3.00% 3.00%        
Actual Allocation       3.00% 2.90%  
Weighted Average Expected Long-Term Rate of Return 0.50% 0.30%        
U.S. Small Cap Funds [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year $ 938,000          
Fair value of plan assets at end of year 931,000 $ 938,000        
Funded status and financial position:            
Fair value of plan assets 938,000 938,000   $ 931,000 $ 938,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 938,000 938,000   931,000 938,000  
U.S. Small Cap Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 467,000          
Fair value of plan assets at end of year 470,000 467,000        
Funded status and financial position:            
Fair value of plan assets 467,000 467,000   470,000 467,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 467,000 467,000   470,000 467,000  
U.S. Small Cap Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 471,000          
Fair value of plan assets at end of year 461,000 471,000        
Funded status and financial position:            
Fair value of plan assets 471,000 471,000   461,000 471,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 471,000 471,000   461,000 471,000  
U.S. Small Cap Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets $ 0 $ 0   $ 0 $ 0  
International Equity [Member]            
Pension assets            
Target Allocation 15.00% 15.00%        
Actual Allocation       14.80% 14.70%  
Weighted Average Expected Long-Term Rate of Return 1.00% 1.30%        
International Equity [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year $ 4,702,000          
Fair value of plan assets at end of year 4,662,000 $ 4,702,000        
Funded status and financial position:            
Fair value of plan assets 4,702,000 4,702,000   $ 4,662,000 $ 4,702,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 4,702,000 4,702,000   4,662,000 4,702,000  
International Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 4,702,000          
Fair value of plan assets at end of year 4,662,000 4,702,000        
Funded status and financial position:            
Fair value of plan assets 4,702,000 4,702,000   4,662,000 4,702,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 4,702,000 4,702,000   4,662,000 4,702,000  
International Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
International Equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
Domestic Bond Funds [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 14,340,000          
Fair value of plan assets at end of year 13,954,000 14,340,000        
Funded status and financial position:            
Fair value of plan assets 14,340,000 14,340,000   13,954,000 14,340,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 14,340,000 14,340,000   13,954,000 14,340,000  
Domestic Bond Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
Domestic Bond Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 14,340,000          
Fair value of plan assets at end of year 13,954,000 14,340,000        
Funded status and financial position:            
Fair value of plan assets 14,340,000 14,340,000   13,954,000 14,340,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 14,340,000 14,340,000   13,954,000 14,340,000  
Domestic Bond Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
Commodity Funds [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 1,541,000          
Fair value of plan assets at end of year 1,584,000 1,541,000        
Funded status and financial position:            
Fair value of plan assets 1,541,000 1,541,000   1,584,000 1,541,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 1,541,000 1,541,000   1,584,000 1,541,000  
Commodity Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
Commodity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 1,541,000          
Fair value of plan assets at end of year 1,584,000 1,541,000        
Funded status and financial position:            
Fair value of plan assets 1,541,000 1,541,000   1,584,000 1,541,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 1,541,000 1,541,000   1,584,000 1,541,000  
Commodity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
Cash and Equivalents [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 970,000          
Fair value of plan assets at end of year 1,086,000 970,000        
Funded status and financial position:            
Fair value of plan assets 970,000 970,000   1,086,000 970,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 970,000 970,000   1,086,000 970,000  
Cash and Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 970,000          
Fair value of plan assets at end of year 1,086,000 970,000        
Funded status and financial position:            
Fair value of plan assets 970,000 970,000   1,086,000 970,000  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 970,000 970,000   1,086,000 970,000  
Cash and Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets 0 0   0 0  
Cash and Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]            
Change in plan assets [Roll Forward]            
Fair value of plan assets at beginning of year 0          
Fair value of plan assets at end of year 0 0        
Funded status and financial position:            
Fair value of plan assets 0 0   0 0  
Plan assets measured at fair value on a recurring basis [Abstract]            
Fair value of plan assets $ 0 $ 0   $ 0 $ 0  
Fixed Income Funds [Member]            
Pension assets            
Target Allocation 45.00% 45.00%        
Actual Allocation       44.30% 44.90%  
Weighted Average Expected Long-Term Rate of Return 0.50% 2.30%        
Other Investments [Member]            
Pension assets            
Target Allocation 7.00% 7.00%        
Actual Allocation       8.40% 7.90%  
Weighted Average Expected Long-Term Rate of Return 0.10% 0.60%