Accumulated Other Comprehensive Income (Loss) (Summary of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
		Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative instruments:
Balance at the beginning of the period			$ 3,582,523	$ 3,553,398	$ 3,606,112	$ 3,710,670
Other comprehensive income (loss) before reclassifications			6,286	5,819	3,635	17,561
(Gain) loss reclassified from accumulated other comprehensive income (loss) to net income			(3,538)	2,646	(6,217)	5,981
Reclassification of the Company's share of previously deferred derivative gains to net income	[1]		0	0	0	(6,723)
Net current-period other comprehensive Income (loss)			2,748	8,465	(2,582)	16,819
Balance at the end of the period		$ 3,553,398	3,568,453	3,443,801	3,568,453	3,443,801
Equity in earnings (losses) from unconsolidated ventures			(6,186)	(6,092)	(10,988)	11,820
Share of investee's other comprehensive income, tax expense (benefit)		1,900			1,900	1,912
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 110 North Wacker
Derivative instruments:
AOCI, reclassification of cash flow hedge		6,700
Equity in earnings (losses) from unconsolidated ventures		8,600
AOCI Attributable to Parent
Derivative instruments:
Balance at the beginning of the period			5,005	(6,103)	10,335	(14,457)
Balance at the end of the period		$ (6,103)	$ 7,753	$ 2,362	$ 7,753	$ 2,362

[1] In March 2022, the Company completed the sale of its ownership interest in 110 North Wacker and released a net of $6.7 million from Accumulated other comprehensive income (loss), representing the Company’s $8.6 million share of previously deferred gains associated with the Venture’s derivative instruments net of tax expense of $1.9 million. See Note 2 - Investments in Unconsolidated Ventures for additional information.