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LONG-TERM DEBT - Receivables Based Credit Facility (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 31, 2017
Nov. 17, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2013
Line of Credit Facility [Line Items]            
Additional borrowings under receivables based credit facility     $ 100,000,000 $ 350,000,000 $ 68,010,000  
Prepaid amount borrowed under receivables based credit facility     2,100,000 $ 123,849,000 $ 315,682,000  
Revolving credit facility            
Line of Credit Facility [Line Items]            
Borrowings outstanding under receivables based credit facility     0      
Maximum borrowing capacity           $ 75,000,000.0
Revolving credit facility | Receivables Based Credit Facility            
Line of Credit Facility [Line Items]            
Additional borrowings under receivables based credit facility   $ 100,000,000        
Borrowings outstanding under receivables based credit facility     330,000,000      
Maximum borrowing capacity     $ 535,000,000.0      
Borrowing base as a percent of eligible accounts receivable     90.00%      
Revolving credit facility | Receivables Based Credit Facility | Subsequent Event            
Line of Credit Facility [Line Items]            
Borrowings outstanding under receivables based credit facility $ 305,000,000          
Prepaid amount borrowed under receivables based credit facility $ 25,000,000