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LONG-TERM DEBT LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Nov. 01, 2016
Debt Instrument [Line Items]      
New Credit Facility $ 458,000   $ 540,000
Total 465,083 $ 480,087  
Current amount of long-term debt (15,940) (4,817)  
Total long-term debt 442,055 467,651  
Outstanding standby letter of credit 670 670  
Capital Lease Obligations      
Debt Instrument [Line Items]      
Other 83 87  
Total Credit Facility [Member]      
Debt Instrument [Line Items]      
New Credit Facility 465,000 480,000  
Deferred Financing Costs [Member]      
Debt Instrument [Line Items]      
Total (7,088) (7,619)  
New Revolver due November 1, 2021      
Debt Instrument [Line Items]      
New Credit Facility 7,000 0 60,000
New Term B Loan due November 1, 2023      
Debt Instrument [Line Items]      
New Credit Facility $ 458,000 $ 480,000 $ 480,000