ACQUISITIONS - Jefferson Terminal Additional Information (Details) - USD ($)
12 Months Ended
Aug. 27, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Transaction related costs   $ 5,683,000 $ 11,450,000 $ 260,000
Jefferson Terminal        
Business Acquisition [Line Items]        
Aggregate purchase price $ 608,300,000      
Assumed liabilities 522,522,000      
Equity consideration 38,200,000      
Percent interest acquired   60.00%    
Remaining non-controlling interest   40.00%    
Loan obtained through acquisition 100,000,000      
Decrease in assumed fixed assets   $ 947,000    
Increase of assumed intangible assets   128,000    
Increase of assumed goodwill   1,358,000    
Increase in assumed accounts payable and accrued liabilities   390,000    
Measurement period adjustments for goodwill and estimated liabilities assumed   $ 149,000    
Jefferson Terminal | Retaining Shareholders        
Business Acquisition [Line Items]        
Remaining non-controlling interest   20.00%    
Jefferson Terminal | Private Equity Fund        
Business Acquisition [Line Items]        
Remaining non-controlling interest   20.00%    
Jefferson Terminal | Subsidiaries        
Business Acquisition [Line Items]        
Long-term debt $ 97,600,000      
Goodwill expected to be tax-deductible   $ 45,000,000