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LONG-TERM DEBT LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total $ 443,639 $ 487,019
Current amount of long-term debt (6,640) (31,832)
Unamortized original issue discount (1,451) (1,731)
Total long-term debt 432,271 448,724
Outstanding standby letter of credit 670 670
Revolver, due November 23, 2016    
Debt Instrument [Line Items]    
Credit Facility 0 26,000
Term B Loan, due November 23, 2018    
Debt Instrument [Line Items]    
Credit Facility 225,000 242,750
Unsecured notes due December 1, 2019    
Debt Instrument [Line Items]    
Senior unsecured notes 220,000 220,000
Capital Lease Obligations    
Debt Instrument [Line Items]    
Other 90 0
Total Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit Facility 225,000 268,750
Net Senior Notes Outstanding [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes 218,549 218,269
Deferred Financing Costs [Member]    
Debt Instrument [Line Items]    
Total $ (4,728) $ (6,463)