LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Extinguishment of Debt Disclosures [Abstract]
Net (gain) loss on debt extinguishment	$ 0	$ 0
Net Interest Expense
Interest expense	10,366	12,052
Amortization of deferred financing costs	1,043	1,118
Amortization of original issue discount of senior notes	66	59
Interest expense on interest rate hedging agreements	0	847
Interest income and other investment income	(1)	(3)
Total net interest expense	$ 11,474	$ 14,073