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LONG-TERM DEBT LIABILITIES (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
number
Dec. 31, 2015
USD ($)
number
Debt Instrument [Line Items]    
Total $ 480,087 $ 487,019
Current amount of long-term debt (4,817) (31,832)
Unamortized original issue discount 0 (1,731)
Total long-term debt 467,651 448,724
Outstanding standby letter of credit $ 670 $ 670
Percent of Common Stock Securing Facility | number 100 100
Revolver, due November 23, 2016    
Debt Instrument [Line Items]    
Former Credit Facility $ 0 $ 26,000
Term B Loan, due November 23, 2018    
Debt Instrument [Line Items]    
Former Credit Facility 0 242,750
Unsecured notes due December 1, 2019    
Debt Instrument [Line Items]    
Senior unsecured notes 0 220,000
Capital Lease Obligations    
Debt Instrument [Line Items]    
Other 87 0
Total Credit Facility [Member]    
Debt Instrument [Line Items]    
New Credit Facility 480,000 0
Former Credit Facility 0 268,750
Net Senior Notes Outstanding [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes 0 218,269
Deferred Financing Costs [Member]    
Debt Instrument [Line Items]    
Total (7,619) (6,463)
New Revolver due November 1, 2021    
Debt Instrument [Line Items]    
New Credit Facility 0 0
New Term B Loan due November 1, 2023    
Debt Instrument [Line Items]    
New Credit Facility $ 480,000 $ 0