Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Narrative) (Details)

v3.21.1
Borrowings (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
May 03, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]      
Total principal outstanding $ 2,977,641,000   $ 3,012,641,000
Period prior to maturity 182 days    
Subsequent Event      
Line of Credit Facility [Line Items]      
Credit facility borrowing base   $ 1,600,000,000  
Minimum      
Line of Credit Facility [Line Items]      
Outstanding principal amount of issuance $ 100,000,000.0    
New Credit Facility      
Line of Credit Facility [Line Items]      
Credit facility borrowing base 1,600,000,000    
Total principal outstanding $ 950,000,000.0    
Interest rate at period end (as a percent) 2.62%    
Letters of credit outstanding $ 24,000,000.0    
New Credit Facility | Subsequent Event      
Line of Credit Facility [Line Items]      
Credit facility borrowing base   $ 1,600,000,000  
New Credit Facility | Federal Funds Rate      
Line of Credit Facility [Line Items]      
Debt instrument interest rate (as a percent) 0.50%    
New Credit Facility | LIBOR      
Line of Credit Facility [Line Items]      
Debt instrument interest rate (as a percent) 1.00%    
New Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Unused capacity, commitment fee (as a percent) 0.50%    
New Credit Facility | Maximum | Base Rate      
Line of Credit Facility [Line Items]      
Debt instrument interest rate (as a percent) 2.00%    
New Credit Facility | Maximum | Eurodollar      
Line of Credit Facility [Line Items]      
Debt instrument interest rate (as a percent) 3.00%    
New Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Unused capacity, commitment fee (as a percent) 0.375%    
New Credit Facility | Minimum | Base Rate      
Line of Credit Facility [Line Items]      
Debt instrument interest rate (as a percent) 1.00%    
New Credit Facility | Minimum | Eurodollar      
Line of Credit Facility [Line Items]      
Debt instrument interest rate (as a percent) 2.00%    
6.25% Senior Notes      
Line of Credit Facility [Line Items]      
Total principal outstanding $ 542,720,000   542,720,000
Debt instrument, interest rate, stated (as a percent) 6.25%    
6.25% Senior Notes | Unsecured debt      
Line of Credit Facility [Line Items]      
Debt instrument, interest rate, stated (as a percent) 6.25%    
6.125% Senior Notes due 2024      
Line of Credit Facility [Line Items]      
Total principal outstanding $ 460,241,000   460,241,000
Debt instrument, interest rate, stated (as a percent) 6.125%    
6.125% Senior Notes due 2024 | Unsecured debt      
Line of Credit Facility [Line Items]      
Debt instrument, interest rate, stated (as a percent) 6.125%    
Second Lien Notes      
Line of Credit Facility [Line Items]      
Total principal outstanding $ 516,659,000   $ 516,659,000
Debt instrument, interest rate, stated (as a percent) 9.00%