LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Interest Expense
Interest expense	$ 47,412	$ 14,790	$ 13,624
Amortization of deferred financing costs	4,405	3,567	3,912
Amortization of original issue discount of senior notes	246	25	0
Interest expense on interest rate hedging agreements	1,392	6,568	12,974
Interest income and other investment income	(9)	(31)	(19)
Total net interest expense	53,446	24,919	30,491
Extinguishment of Debt Disclosures [Abstract]
Write-off of unamortized deferred financing costs	747	1,144	62
Amount of debt retired early	$ 0	$ 595,500	$ 6,579