LONG-TERM DEBT (Details) (USD $)	0 Months Ended				12 Months Ended
	Aug. 01, 2014	Dec. 09, 2013	May 07, 2013	Nov. 27, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 01, 2014
Debt
Senior secured term loan					$ 591,543,000	$ 396,503,000
Less: unamortized discount, net					(2,929,000)	(1,247,000)
Net long-term debt					588,614,000	395,256,000
Less: current portion					(5,945,000)	(3,975,000)
Long-term debt, less current portion					582,669,000	391,281,000
Proceeds from issuance of long-term debt					198,000,000	200,502,000	198,000,000
Debt issuance costs, net					8,099,000	6,687,000
Interest on long-term debt					23,363,000	20,291,000	1,210,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months					5,945,000
Long-term Debt, Maturities, Repayments of Principal in Year Two					5,945,000
Long-term Debt, Maturities, Repayments of Principal in Year Three					5,945,000
Long-term Debt, Maturities, Repayments of Principal in Year Four					5,945,000
Long-term Debt, Maturities, Repayments of Principal in Year Five					5,945,000
Long-term Debt, Maturities, Repayments of Principal after Year Five					561,818,000
Debt Instrument Carrying Amount, Noncurrent					591,543,000
Senior secured term loan
Debt
Less: unamortized discount, net	(2,000,000)			(2,000,000)				(2,000,000)
Amount borrowed	200,000,000		200,000,000	200,000,000				200,000,000
Proceeds from issuance of long-term debt	198,000,000		201,000,000	198,000,000
Original issue premium			1,000,000
Additional increase in debt	200,000,000		200,000,000					200,000,000
Amount of long-term debt refinanced		397,500,000
Debt Instrument, Maturity Period from Prior Term Loans Maturity Date		1 year
Maximum restricted junior payments	200,000,000							200,000,000
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					8,100,000	6,700,000
Accumulated amortization					2,200,000	1,000,000
Interest on long-term debt					23,400,000	20,300,000	1,200,000
Senior secured term loan | Maximum
Debt
Leverage ratio to be maintained under the credit facility covenants					3
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%