LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Interest Expense
Interest expense	$ 8,623	$ 8,490
Amortization of deferred financing costs	687	707
Amortization of original issue discount of senior notes	91	82
Interest expense on interest rate hedging agreements	0	0
Interest income and other investment income	(9)	0
Total net interest expense	$ 9,392	$ 9,279