Indebtedness (Summary of Book Value and Changes in Fair Value of Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Book value	$ 3,651,069	$ 3,689,282
Fair value	3,494,217	3,840,754
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	260,000
Payments/Payoffs	(301,064)
Adjustments to fair value	(305,473)
Long-term Debt, Gross	3,693,586	3,734,722
Debt Issuance Costs, Net	42,517	45,440
Fixed Rate Secured Debt [Member]
Book value	57,286	58,422
Fair value	54,784	59,989
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0
Payments/Payoffs	(1,064)
Adjustments to fair value	(4,141)
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	3,375,000	3,675,000
Fair value	3,178,133	3,779,465
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0
Payments/Payoffs	(300,000)
Adjustments to fair value	(301,332)
Unsecured Line of Credit DRLP [Member]
Book value	260,000	0
Fair value	260,000	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	260,000
Payments/Payoffs	0
Adjustments to fair value	$ 0

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 of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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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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