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
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (26,052) $ (30,733)
Less: current maturities of long term debt (622) (651)
Long-term debt, net of current maturities 2,076,569 2,086,765
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 340,000 350,000
Net unamortized debt issuance costs $ (3,600)  
Stated interest rate, percent 6.625%  
6.000% senior unsecured notes due 2024 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 630,796 650,000
Net unamortized debt issuance costs $ (7,500)  
Stated interest rate, percent 6.00%  
6.375% senior unsecured notes due 2025 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 577,268 600,000
Net unamortized debt issuance costs $ (10,800)  
Stated interest rate, percent 6.375%  
6.375% senior unsecured notes due 2026 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 397,529 450,000
Net unamortized debt issuance costs $ (4,000)  
Stated interest rate, percent 6.375%  
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement    
Debt Instrument [Line Items]    
Long-term debt $ 135,000 45,000
InterBank | Letter of credit | Construction loan    
Debt Instrument [Line Items]    
Long-term debt $ 22,650 $ 23,149