Accumulated Other Comprehensive Income (Loss) (Summary of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
		Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative instruments:
Balance at the beginning of the period			$ 3,568,453	$ 3,443,801	$ 3,606,112	$ 3,710,670
Other comprehensive income (loss) before reclassifications			5,420	6,794	9,055	24,355
(Gain) loss reclassified from accumulated other comprehensive income (loss) to net income			(5,602)	728	(11,819)	6,709
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)			(182)	7,522	(2,764)	24,341
Balance at the end of the period			3,029,651	3,550,891	3,029,651	3,550,891
Equity in earnings (losses) from unconsolidated ventures			(30,886)	7,708	(41,874)	19,528
Share of investee's other comprehensive income, tax expense (benefit)		$ 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			7,753	2,362	10,335	(14,457)
Balance at the end of the period			$ 7,571	$ 9,884	$ 7,571	$ 9,884

[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.