LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Interest Expense
Interest expense	$ 5,920	$ 8,324	$ 16,913	$ 25,382
Amortization of deferred financing costs	586	611	1,752	1,929
Amortization of original issue discount of senior notes	0	96	0	280
Interest expense on interest rate hedging agreements	0	0
Interest income and other investment income	(30)	(17)	(79)	(38)
Total net interest expense	$ 6,476	$ 9,014	18,586	27,553
Extinguishment of Debt [Line Items]
Gains (Losses) on Extinguishment of Debt			$ 0	$ 0