LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Interest Expense
Interest expense	$ 8,324	$ 8,915	$ 25,382	$ 25,919
Amortization of deferred financing costs	611	730	1,929	2,153
Amortization of original issue discount of senior notes	96	86	280	251
Interest expense on interest rate hedging agreements	0	0	0	0
Interest income and other investment income	(17)	0	(38)	0
Total net interest expense	$ 9,014	$ 9,731	$ 27,553	$ 28,323