LONG-TERM DEBT (Details)		3 Months Ended		6 Months Ended
	Aug. 01, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	May. 19, 2015	Dec. 31, 2014 USD ($)	May. 07, 2013 USD ($)
Debt
Senior secured term loan		$ 572,571,000		$ 572,571,000			$ 591,543,000
Less: unamortized discount, net		(2,633,000)		(2,633,000)			(2,929,000)
Net long-term debt		569,938,000		569,938,000			588,614,000
Less: current portion		(5,945,000)		(5,945,000)			(5,945,000)
Long-term debt, less current portion		563,993,000		563,993,000			582,669,000
Extinguishment of Debt, Amount				16,000,000
Gains (Losses) on Extinguishment of Debt		1,114,000	$ 0	1,114,000	$ 0
Debt issuance costs, net		7,281,000		7,281,000			8,099,000
Interest on long-term debt		$ 7,195,000	4,784,000	14,355,000	9,560,000
Senior secured term loan
Debt
Debt Instrument Accordion Feature Increase in Additional Borrowings								$ 200,000,000
Aggregate amount of each consecutive quarterly scheduled principal installment	$ 1,500,000
Mandatory prepayments owed				$ 0
Percentage discount of par received on early extinguishment of debt						9.00%
Interest rate at the end of the period (as a percent)		4.50%		4.50%
Debt issuance costs, net		$ 7,300,000		$ 7,300,000			8,100,000
Accumulated amortization		3,000,000		3,000,000			$ 2,200,000
Interest on long-term debt		$ 7,200,000	$ 4,800,000	$ 14,400,000	$ 9,600,000
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%