Indebtedness (Summary of Book Value and Changes in Fair Value of Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Book value	$ 3,888,680	$ 3,689,282
Fair value	3,521,657	3,840,754
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	500,000
Payments/Payoffs	(302,143)
Adjustments to fair value	(516,954)
Long-term Debt, Gross	3,932,435	3,734,722
Debt Issuance Costs, Net	43,755	45,440
Fixed Rate Secured Debt [Member]
Book value	56,135	58,422
Fair value	51,779	59,989
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0
Payments/Payoffs	(2,143)
Adjustments to fair value	(6,067)
Variable Rate Secured Debt [Member]
Book value	1,300	1,300
Fair value	1,300	1,300
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0
Payments/Payoffs	0
Adjustments to fair value	0
Unsecured Debt [Member]
Book value	3,875,000	3,675,000
Fair value	3,468,578	$ 3,779,465
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	500,000
Payments/Payoffs	(300,000)
Adjustments to fair value	$ (510,887)

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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