LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Interest Expense
Interest expense	$ 34,764	$ 34,656	$ 40,091
Amortization of deferred financing costs	2,863	3,860	3,870
Amortization of original issue discount of senior notes	340	305	274
Interest expense on interest rate hedging agreements	0	0	0
Interest income and other investment income	(6)	0	(3)
Total net interest expense	$ 37,961	$ 38,821	$ 44,232