LONG-TERM DEBT (Details)		1 Months Ended	3 Months Ended
	Aug. 01, 2014 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	May. 07, 2013 USD ($)
Debt
Senior secured term loan			$ 535,112,000		$ 536,598,000
Less: debt issuance costs, net			(5,862,000)		(6,184,000)
Less: unamortized discount, net			(2,120,000)		(2,236,000)
Net long-term debt			527,130,000		528,178,000
Less: current portion			(5,945,000)		(5,945,000)
Long-term debt, less current portion			521,185,000		522,233,000
Interest on long-term debt			6,541,000	$ 7,160,000
Senior secured term loan
Debt
Less: debt issuance costs, net			(5,900,000)		(6,200,000)
Debt Instrument Accordion Feature Increase in Additional Borrowings						$ 200,000,000.0
Aggregate amount of each consecutive quarterly scheduled principal installment	$ 1,486,000
Mandatory prepayments owed			$ 0
Interest rate at the end of the period (as a percent)			4.50%
Accumulated amortization			$ 4,400,000		$ 4,100,000
Interest on long-term debt			$ 6,500,000	$ 7,200,000
Senior secured term loan | Maximum
Debt
Leverage ratio to be maintained under the credit facility covenants			3.0
Covenant threshold, leverage ratio			3.50
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 | Minimum
Debt
Leverage ratio to be maintained under the credit facility covenants			1.00
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%
Subsequent Event [Member]
Debt
Net long-term debt		$ 499,500,000
Extinguishment of Debt, Amount		$ 28,000,000
Percentage discount of par received on early extinguishment of debt		13.10%