Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Proceeds from maturities of U.S. Treasury bills	$ 468,598	$ 299,668
US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Proceeds from maturities of U.S. Treasury bills	477,000
Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	99,050		$ 96,322
Loans receivable (included in investments in partially owned entities and in other assets)	56,549		54,397
Interest rate swaps and caps (included in other assets)	242,379		183,804
Total assets	397,978		806,485
Mandatorily redeemable instruments (included in other liabilities)	49,383		49,383
Interest rate swaps (included in other liabilities)	1,280
Total liabilities	50,663
Recurring \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Investments in U.S. Treasury bills			471,962
Recurring \| Level 1
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	60,397		57,406
Loans receivable (included in investments in partially owned entities and in other assets)	0		0
Interest rate swaps and caps (included in other assets)	0		0
Total assets	60,397		529,368
Mandatorily redeemable instruments (included in other liabilities)	49,383		49,383
Interest rate swaps (included in other liabilities)	0
Total liabilities	49,383
Recurring \| Level 1 \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Investments in U.S. Treasury bills			471,962
Recurring \| Level 2
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	0		0
Loans receivable (included in investments in partially owned entities and in other assets)	0		0
Interest rate swaps and caps (included in other assets)	242,379		183,804
Total assets	242,379		183,804
Mandatorily redeemable instruments (included in other liabilities)	0		0
Interest rate swaps (included in other liabilities)	1,280
Total liabilities	1,280
Recurring \| Level 2 \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Investments in U.S. Treasury bills			0
Recurring \| Level 3
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	38,653		38,916
Loans receivable (included in investments in partially owned entities and in other assets)	56,549		54,397
Interest rate swaps and caps (included in other assets)	0		0
Total assets	95,202		93,313
Mandatorily redeemable instruments (included in other liabilities)	0		0
Interest rate swaps (included in other liabilities)	0
Total liabilities	0
Recurring \| Level 3 \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Investments in U.S. Treasury bills			0
Restricted Cash \| Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	30,384		7,763
Other Assets \| Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	68,666		88,559
Loans receivable (included in investments in partially owned entities and in other assets)	4,455		4,306
Investments in Partially Owned Properties \| Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Loans receivable (included in investments in partially owned entities and in other assets)	$ 52,094		$ 50,091

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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-Publisher FASB
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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-3

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Fair value portion of shares that an entity is required to redeem for cash or other assets at a fixed or determinable date or upon the occurrence of an event.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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