v3.19.3
LONG-TERM DEBT LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Nov. 17, 2017
Debt Instrument [Line Items]      
Notes $ 325,000 $ 0  
Senior unsecured notes 412,338 414,158  
Total 1,740,959 1,889,240  
Deferred Financing Costs (17,003) (17,037)  
Total long-term debt 1,723,956 1,872,203  
Outstanding standby letter of credit 5,862 5,862  
Stated interest rate percentage, senior unsecured debt     7.25%
Capital Lease Obligations      
Debt Instrument [Line Items]      
Other 881 912  
Total Credit Facility [Member]      
Debt Instrument [Line Items]      
New Credit Facility 1,002,740 1,474,170  
Term B Loan, due November 17, 2024 [Member]      
Debt Instrument [Line Items]      
New Credit Facility 866,700 1,291,700  
Unamortized Premium on Debt 2,040 2,470  
Senior Notes due October 17, 2024 [Member]      
Debt Instrument [Line Items]      
Senior unsecured notes $ 400,000 400,000  
Stated interest rate percentage, senior unsecured debt 7.25%    
Unamortized Premium on Debt $ 12,338 14,158  
RevolverDueNovember172022Member [Member]      
Debt Instrument [Line Items]      
New Credit Facility 134,000 180,000  
Notes Due May 1, 2027 [Member]      
Debt Instrument [Line Items]      
Notes $ 325,000 $ 0  
Stated interest rate percentage, senior unsecured debt 6.50%