LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Extinguishment of Debt Disclosures [Abstract]
Net (gain) loss on debt extinguishment	$ 0	$ 0	$ 0	$ 0
Net Interest Expense
Interest expense	10,233	11,839	20,600	23,891
Amortization of deferred financing costs	1,010	1,054	2,053	2,172
Amortization of original issue discount of senior notes	68	61	133	120
Interest expense on interest rate hedging agreements	0	545	0	1,392
Interest income and other investment income	(1)	(3)	(2)	(6)
Total net interest expense	$ 11,310	$ 13,496	$ 22,784	$ 27,569