DEBT - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 693	$ 727	$ 1,334	$ 2,550
Amortization of debt discount	142	129	282	195
Other, net	(76)	(11)	(249)	(42)
Interest expense	9,080	9,135	18,243	19,634
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense	223	184	870	768
Term Loan Facilities
Debt Instrument [Line Items]
Interest expense	3,660	3,669	7,279	9,419
Senior Unsecured 8.875% Notes
Debt Instrument [Line Items]
Interest expense	$ 4,438	$ 4,437	$ 8,727	$ 6,744