LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Interest Expense
Interest expense	$ 8,513	$ 8,689	$ 17,004	$ 17,432
Amortization of deferred financing costs	716	1,048	1,423	2,134
Amortization of original issue discount of senior notes	84	75	165	149
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	$ 9,313	$ 9,812	$ 18,592	$ 19,715