Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
LONG-TERM DEBT (Break-Down of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (28,426) $ (30,733)
Less: current maturities of long term debt (615) (651)
Long-term debt, net of current maturities 2,198,678 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 350,000 350,000
Net unamortized debt issuance costs $ (4,000)  
Stated interest rate, percent 6.625%  
6.000% senior unsecured notes due 2024 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 650,000 650,000
Net unamortized debt issuance costs $ (8,100)  
Stated interest rate, percent 6.00%  
6.375% senior unsecured notes due 2025 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 600,000 600,000
Net unamortized debt issuance costs $ (11,700)  
Stated interest rate, percent 6.375%  
6.375% senior unsecured notes due 2026 | Senior notes    
Debt Instrument [Line Items]    
Long-term debt $ 450,000 450,000
Net unamortized debt issuance costs $ (4,700)  
Stated interest rate, percent 6.375%  
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement    
Debt Instrument [Line Items]    
Long-term debt $ 155,000 45,000
InterBank | Letter of credit | Construction loan    
Debt Instrument [Line Items]    
Long-term debt $ 22,719 $ 23,149