LONG-TERM DEBT - Summary of Indebtedness (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-term debt
Total debt	$ 1,148,100	$ 1,150,600
Less: debt issuance costs and discount	(27,105)	(28,720)
Total debt after debt issuance costs and discount	1,120,995	1,121,880
Less: current portion of long-term debt	(10,000)	(10,000)
Long-term debt, less current portion	1,110,995	1,111,880
Senior secured term Loan
Long-term debt
Total debt	463,100	465,600
Senior secured notes
Long-term debt
Total debt	335,000	335,000
Senior unsecured notes
Long-term debt
Total debt	$ 350,000	$ 350,000