DEFINED CONTRIBUTION PLANS (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Minimum Pension Liability, before Tax | $ 18,817 | $ 19,271 | |
| Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | (18,817) | (19,271) | |
| Defined Benefit Plan, Contributions by Employer | $ 600 | 1,800 | |
| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% | ||
| Defined Contribution Plan, Cost Recognized | $ 3,700 | $ 3,600 | $ 2,200 |
| Employees not subject to collective bargaining agreement [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Employer matching contribution (in hundredths) | 50.00% | ||