LONG TERM DEBT AND CAPITAL LEASES - Components of Interest Expense (Details) - USD ($) $ in Thousands	8 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2014
Debt Disclosure [Abstract]
Interest expense on long-term debt and capital leases	$ 23,065	$ 34,741	$ 35,868	$ 34,216
Amortization of debt issuance costs and discounts on long-term debt	2,193	3,881	3,977	3,000
Letter of credit fees	714	593	637	1,215
Less: capitalized interest	(333)	(273)	(62)	(256)
Total interest expense	$ 25,639	$ 38,942	$ 40,420	$ 38,175