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Debt (Summary of Senior Notes) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Net premiums, discounts, and issuance costs (b) $ (14,158) $ (14,295)
Total senior notes 2,711,796 2,711,659
Other notes payable 44,136 53,381
Notes payable (2,755,932) (2,765,040)
Estimated fair value $ 2,797,273 $ 3,152,046
Senior Notes | 4.250% unsecured senior notes due March 2021    
Debt Instrument [Line Items]    
Stated interest rate 4.25% 4.25%
Face amount $ 425,954 $ 425,954
Senior Notes | 5.500% unsecured senior notes due March 2026    
Debt Instrument [Line Items]    
Stated interest rate 5.50% 5.50%
Face amount $ 700,000 $ 700,000
Senior Notes | 5.000% unsecured senior notes due January 2027    
Debt Instrument [Line Items]    
Stated interest rate 5.00% 5.00%
Face amount $ 600,000 $ 600,000
Senior Notes | 7.875% unsecured senior notes due June 2032    
Debt Instrument [Line Items]    
Stated interest rate 7.875% 7.875%
Face amount $ 300,000 $ 300,000
Senior Notes | 6.375% unsecured senior notes due May 2033    
Debt Instrument [Line Items]    
Stated interest rate 6.375% 6.375%
Face amount $ 400,000 $ 400,000
Senior Notes | 6.000% unsecured senior notes due February 2035    
Debt Instrument [Line Items]    
Stated interest rate 6.00% 6.00%
Face amount $ 300,000 $ 300,000