LONG-TERM DEBT (Details) (USD $)	6 Months Ended			0 Months Ended				6 Months Ended		0 Months Ended
	Jun. 30, 2013	May 07, 2013	Dec. 31, 2012	May 07, 2013 Senior secured term loan	Nov. 27, 2012 Senior secured term loan	Jun. 30, 2013 Senior secured term loan	Dec. 31, 2012 Senior secured term loan	Jun. 30, 2013 Senior secured term loan Adjusted Eurodollar Rate	Jun. 30, 2013 Senior secured term loan Base Rate	May 07, 2013 Incremental Term Loan
Debt
Senior secured term loan	$ 398,500,000	$ 400,000,000	$ 200,000,000
Less: Unamortized discount, net	(821,000)		(1,973,000)		(2,000,000)
Net long-term debt	397,679,000		198,027,000
Less: Current portion	(4,000,000)		(2,000,000)
Long-term debt, less current portion	393,679,000		196,027,000
Amount borrowed					200,000,000					200,000,000
Original issue discount (as a percent)					1.00%
Original issue premium										1,000,000
Proceeds from issuance of long-term debt	201,000,000				198,000,000					201,000,000
Quarterly principal installments of loan as a percentage of the initial principal amount										0.25%
Aggregate amount of each quarterly scheduled principal installment				1,000,000
Payment of legal fees and other costs	2,400,000									2,400,000
Reference rate								Adjusted Eurodollar Rate	Base Rate
Fixed interest rate base (as a percent)								1.25%	2.25%
Interest rate margin (as a percent)								4.50%	3.50%
Debt issuance costs, net	6,394,000		4,260,000			6,400,000	4,300,000
Accumulated amortization						$ 500,000	$ 100,000
Interest rate at the end of the period (as a percent)						5.75%