LONG-TERM DEBT - Interest Rate and Fees (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016
Receivables Based Credit Facility | Federal funds effective rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Senior secured credit facilities | Term loan D | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate	5.75%
Senior secured credit facilities | Term loan D | Eurocurrency rate
Debt Instrument [Line Items]
Basis spread on variable rate	6.75%
Senior secured credit facilities | Term loan E | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate	6.50%
Senior secured credit facilities | Term loan E | Eurocurrency rate
Debt Instrument [Line Items]
Basis spread on variable rate	7.50%
Minimum | Receivables Based Credit Facility
Debt Instrument [Line Items]
Commitment fee rate	0.25%
Minimum | Receivables Based Credit Facility | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Minimum | Receivables Based Credit Facility | Eurocurrency rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Maximum | Receivables Based Credit Facility
Debt Instrument [Line Items]
Commitment fee rate	0.375%
Maximum | Receivables Based Credit Facility | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Maximum | Receivables Based Credit Facility | Eurocurrency rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%