Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Break-Down of Long-Term Debt) (Details)

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LONG-TERM DEBT (Break-Down of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (22,395) $ (23,751)
Less: current maturities of long term debt (688) (631)
Long-term debt, net of current maturities 1,898,362 1,978,020
Construction loan    
Debt Instrument [Line Items]    
Net unamortized debt issuance costs (100)  
6.625% senior unsecured notes due 2023 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt 329,467 329,467
Net unamortized debt issuance costs $ (3,100)  
Stated interest rate, percent 6.625%  
6.000% senior unsecured notes due 2024 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 595,903 603,428
Net unamortized debt issuance costs $ (6,500)  
Stated interest rate, percent 6.00%  
6.375% senior unsecured notes due 2025 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 521,360 529,525
Net unamortized debt issuance costs $ (9,100)  
Stated interest rate, percent 6.375%  
6.375% senior unsecured notes due 2026 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 387,367 397,529
Net unamortized debt issuance costs $ (3,600)  
Stated interest rate, percent 6.375%  
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement    
Debt Instrument [Line Items]    
Long-term debt $ 65,000 120,000
InterBank | Letter of credit | Construction loan    
Debt Instrument [Line Items]    
Long-term debt $ 22,348 $ 22,453