Debt (Summary of Senior Notes) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Net premiums, discounts, and issuance costs (b)	$ (14,022)	$ (14,295)
Total senior notes	2,711,932	2,711,659
Other notes payable	58,686	53,381
Notes payable	(2,770,618)	(2,765,040)
Estimated fair value	$ 3,084,190	$ 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

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

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