LONG-TERM DEBT (Details)			12 Months Ended
	Aug. 01, 2014 USD ($)	Dec. 08, 2013	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Nov. 27, 2012 USD ($)
Debt
Less: unamortized discount, net			$ (2,236,000)	$ (2,929,000)
Net long-term debt			534,362,000	588,614,000
Less: current portion			(5,945,000)	(5,945,000)
Long-term debt, less current portion			528,417,000	582,669,000
Proceeds from issuance of long-term debt			0	198,000,000	$ 200,502,000
Extinguishment of Debt, Amount			$ 49,000,000
Weighted Average discount of par received on early extinguishment of debt			10.30%
Gains (Losses) on Extinguishment of Debt			$ 3,836,000	0	0
Debt issuance costs, net			6,184,000	8,099,000
Interest on long-term debt			28,208,000	23,363,000	20,291,000
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			512,818,000
Debt Instrument Carrying Amount, Noncurrent			536,598,000
Senior secured term loan
Debt
Amount borrowed						$ 200,000,000
Debt Instrument, Maturity Period from Prior Term Loans Maturity Date		1 year
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			$ 6,200,000	8,100,000
Accumulated amortization			4,100,000	2,200,000
Interest on long-term debt			$ 28,200,000	23,400,000	$ 20,300,000
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 | 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%
Fair value measurements
Debt
Long-term Debt, Gross			$ 536,598,000	$ 591,543,000