LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Interest Expense
Interest expense	$ 8,915	$ 8,644	$ 25,919	$ 26,076
Amortization of deferred financing costs	730	1,031	2,153	3,165
Amortization of original issue discount of senior notes	86	77	251	226
Interest expense on interest rate hedging agreements	0	0	0	0
Interest income and other investment income	0	0	0	0
Total net interest expense	$ 9,731	$ 9,752	$ 28,323	$ 29,467