LONG-TERM DEBT (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2012	Nov. 27, 2012 Senior secured term loan	Dec. 31, 2012 Senior secured term loan	Dec. 31, 2012 Senior secured term loan Maximum	Dec. 31, 2012 Senior secured term loan Adjusted Eurodollar Rate	Dec. 31, 2012 Senior secured term loan Base Rate
Debt
Senior Secured Term Loan	$ 200,000,000
Less: original issue discount	(1,973,000)				(2,000,000)
Net long-term debt	198,027,000
Less: current portion	(2,000,000)
Long-term debt, less current portion	196,027,000
Term of loan facility					7 years
Amount borrowed					200,000,000
Original issue discount (as a percent)					1.00%
Proceeds from issuance of long-term debt	198,000,000				2,000,000
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%
Quarterly principal installments of loan as a percentage of the initial principal amount						0.25%
Leverage ratio to be maintained under the credit facility covenants							2.5
Fee, as percentage of principal amount of loan prepaid, for prepayment within one year of initial borrowing						1.00%
Number of days within which the entity fails to pay principal when due or interest or any other amount owing on any other obligation under the credit agreement, is considered as event of default							5 days
Amount of principal or interest if failed to pay considered as event of default							40,000,000
Amount of debt which results in acceleration of debt if failed to pay considered as event of default							40,000,000
Amount of unbonded, undischarged or unstayed debt under entry by court of one or more judgments for certain period to determine as event of default							40,000,000
Debt issuance costs, net	4,260,000			4,300,000		4,300,000
Accumulated amortization						100,000
Interest on Long-term debt	$ 1,210,000	$ 85,000	$ 119,000			$ 1,200,000