Debt (Summary of Senior Notes) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net premiums, discounts, and issuance costs (b)	$ (12,222)	$ (13,750)
Total senior notes	1,987,778	2,712,204
Other notes payable	44,159	40,098
Notes payable	2,031,937	2,752,302
Estimated fair value	$ 2,507,209	3,415,662
Senior Notes \| 4.250% unsecured senior notes due March 2021
Debt Instrument [Line Items]
Stated interest rate	4.25%
Face amount	$ 0	425,954
Senior Notes \| 5.500% unsecured senior notes due March 2026
Debt Instrument [Line Items]
Stated interest rate	5.50%
Face amount	$ 500,000	700,000
Senior Notes \| 5.000% unsecured senior notes due January 2027
Debt Instrument [Line Items]
Stated interest rate	5.00%
Face amount	$ 500,000	600,000
Senior Notes \| 7.875% unsecured senior notes due June 2032
Debt Instrument [Line Items]
Stated interest rate	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%
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%
Face amount	$ 300,000	$ 300,000

Face (par) amount of debt instrument at time of issuance.

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