Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
LONG-TERM DEBT (Break-Down of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (29,628) $ (30,733)
Less: current maturities of long term debt (656) (651)
Long-term debt, net of current maturities 2,087,714 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 $ (4,200)  
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 $ (8,400)  
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 $ (12,100)  
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 $ (4,900)  
Stated interest rate, percent 6.375%  
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement    
Debt Instrument [Line Items]    
Long-term debt $ 45,000 45,000
InterBank | Letter of credit | Construction loan    
Debt Instrument [Line Items]    
Long-term debt $ 22,998 $ 23,149