Debt (Summary of Senior Notes) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Net premiums, discounts, and issuance costs (b)	$ (13,200)	$ (13,057)
Total senior notes	2,986,800	2,986,943
Other notes payable	18,618	20,024
Notes payable	3,005,418	3,006,967
Estimated fair value	$ 2,959,080	$ 3,263,774
4.250% unsecured senior notes due March 2021 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.25%	4.25%
Face amount	$ 700,000	$ 700,000
5.500% unsecured senior notes due March 2026 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.50%	5.50%
Face amount	$ 700,000	$ 700,000
5.000% unsecured senior notes due January 2027 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.00%	5.00%
Face amount	$ 600,000	$ 600,000
7.875% unsecured senior notes due June 2032 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate	7.875%	7.875%
Face amount	$ 300,000	$ 300,000
6.375% unsecured senior notes due May 2033 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate	6.375%	6.375%
Face amount	$ 400,000	$ 400,000
6.000% unsecured senior notes due February 2035 \| Senior Notes
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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