LONG-TERM DEBT (Details) (USD $)	0 Months Ended	3 Months Ended
	Aug. 01, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt
Senior secured term loan		$ 590,057,000		$ 591,543,000
Less: unamortized discount, net		(2,802,000)		(2,929,000)
Net long-term debt		587,255,000		588,614,000
Less: current portion		(5,945,000)		(5,945,000)
Long-term debt, less current portion		581,310,000		582,669,000
Debt issuance costs, net		7,747,000		8,099,000
Interest on long-term debt		7,160,000	4,776,000
Senior secured term loan
Debt
Aggregate amount of each consecutive quarterly scheduled principal installment	1,500,000
Term of senior secured loan agreement	7 years
Mandatory prepayments owed		0
Interest rate at the end of the period (as a percent)		4.50%
Debt issuance costs, net		7,700,000		8,100,000
Accumulated amortization		2,500,000		2,200,000
Interest on long-term debt		7,200,000	4,800,000
Senior secured term loan | Maximum
Debt
Leverage ratio to be maintained under the credit facility covenants		3.0
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
Senior secured term loan | Adjusted Eurodollar Rate
Debt
Reference rate		Adjusted Eurodollar Rate
Fixed interest rate base (as a percent)		1.00%
Interest rate margin (as a percent)		3.50%
Senior secured term loan | Base Rate
Debt
Reference rate		Base Rate
Fixed interest rate base (as a percent)		2.00%
Interest rate margin (as a percent)		2.50%