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LONG-TERM DEBT LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Nov. 01, 2016
Debt Instrument [Line Items]      
New Credit Facility     $ 540,000
Former Credit Facility $ 0 $ 480,000  
Senior unsecured notes 416,584 0  
Total   480,087  
Current amount of long-term debt (13,319) (4,817)  
Total long-term debt 1,859,442 467,651  
Outstanding standby letter of credit $ 1,856 670  
Stated interest rate percentage, senior unsecured debt 7.25%    
Capital Lease Obligations      
Debt Instrument [Line Items]      
Other $ 70 87  
Total Credit Facility [Member]      
Debt Instrument [Line Items]      
New Credit Facility 1,475,904    
Deferred Financing Costs [Member]      
Debt Instrument [Line Items]      
Total (19,797) (7,619)  
New Revolver due November 1, 2021      
Debt Instrument [Line Items]      
New Credit Facility   0 60,000
Former Credit Facility 0 0  
New Term B Loan due November 1, 2023      
Debt Instrument [Line Items]      
New Credit Facility   0 $ 480,000
Former Credit Facility 0 480,000  
Term B Loan, due November 17, 2024 [Member]      
Debt Instrument [Line Items]      
New Credit Facility 1,330,000 0  
Unamortized Premium on Debt 2,904 0  
Senior Notes due October 17, 2024 [Member]      
Debt Instrument [Line Items]      
Senior unsecured notes 400,000 0  
Unamortized Premium on Debt 16,584 0  
RevolverDueNovember172022Member [Member]      
Debt Instrument [Line Items]      
New Credit Facility $ 143,000 $ 0