Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Summary of Long-Term Debt (Details)

v3.19.3.a.u2
Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Net unamortized debt issuance costs $ (23,751) $ (30,733)  
Less: current maturities of long term debt (631) (651)  
Debt reflected as long term 1,978,020 2,086,765  
Senior notes | 6.625% Senior Notes Due 2023      
Debt Instrument [Line Items]      
Long-tern debt 329,467 $ 350,000  
Net unamortized debt issuance costs $ (3,300)    
Stated interest rate 6.625% 6.625% 6.625%
Senior notes | 6.000% Senior Notes Due 2024      
Debt Instrument [Line Items]      
Long-tern debt $ 603,428 $ 650,000  
Net unamortized debt issuance costs $ (6,900)    
Stated interest rate 6.00% 6.00% 6.00%
Senior notes | 6.375% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Long-tern debt $ 529,525 $ 600,000  
Net unamortized debt issuance costs $ (9,600)    
Stated interest rate 6.375% 6.375% 6.375%
Senior notes | 6.375% Senior Notes Due 2026      
Debt Instrument [Line Items]      
Long-tern debt $ 397,529 $ 450,000  
Net unamortized debt issuance costs $ (3,900)    
Stated interest rate 6.375% 6.375% 6.375%
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Amended and Restated Credit Agreement      
Debt Instrument [Line Items]      
Long-tern debt $ 120,000 $ 45,000  
InterBank | Letter of credit | Construction loans      
Debt Instrument [Line Items]      
Long-tern debt 22,453 $ 23,149  
Net unamortized debt issuance costs $ (100)