LONG-TERM DEBT (Details) (USD $)	0 Months Ended			3 Months Ended		6 Months Ended
	Dec. 09, 2013	May 07, 2013	Nov. 27, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Debt
Senior secured term loan				$ 394,517,000		$ 394,517,000		$ 396,503,000
Less: unamortized discount, net				(1,157,000)		(1,157,000)		(1,247,000)
Net long-term debt				393,360,000		393,360,000		395,256,000
Less: current portion				(3,975,000)		(3,975,000)		(3,975,000)
Long-term debt, less current portion				389,385,000		389,385,000		391,281,000
Proceeds from issuance of long-term debt							201,000,000
Debt issuance costs, net				6,158,000		6,158,000		6,687,000
Interest on long-term debt				4,784,000	4,902,000	9,560,000	8,114,000
Senior secured term loan
Debt
Less: unamortized discount, net			(2,000,000)
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
Additional increase in debt				200,000,000		200,000,000
Amount of long-term debt refinanced	397,500,000
Maturity period from prior term loans' maturity date	1 year
Aggregate amount of each consecutive quarterly scheduled principal installment	1,000,000
Mandatory prepayments owed						0
Interest rate at the end of the period (as a percent)				4.50%		4.50%
Debt issuance costs, net				6,200,000		6,200,000		6,700,000
Accumulated amortization				1,500,000		1,500,000		1,000,000
Interest on long-term debt				4,800,000	4,900,000	9,600,000	8,100,000
Senior secured term loan | Maximum
Debt
Loan term	7 years
Leverage ratio to be maintained under the credit facility covenants						2.75
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%