Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 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	$ 197,294	$ 0
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	200,000
Amortized cost, current	276,615		$ 473,171
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)	98,996		96,322
Loans receivable (included in investments in partially owned entities and in other assets)	55,269		54,397
Interest rate swaps and caps (included in other assets)	129,208		183,804
Total assets	560,118		806,485
Mandatorily redeemable instruments (included in other liabilities)	49,383		49,383
Interest rate swaps (included in other liabilities)	15,009
Total liabilities	64,392
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	276,645		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)	58,369		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	335,014		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	276,645		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)	129,208		183,804
Total assets	129,208		183,804
Mandatorily redeemable instruments (included in other liabilities)	0		0
Interest rate swaps (included in other liabilities)	15,009
Total liabilities	15,009
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		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)	40,627		38,916
Loans receivable (included in investments in partially owned entities and in other assets)	55,269		54,397
Interest rate swaps and caps (included in other assets)	0		0
Total assets	95,896		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		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)	11,209		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)	87,787		88,559
Loans receivable (included in investments in partially owned entities and in other assets)	4,177		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)	$ 51,092		$ 50,091

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

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
-Publisher FASB
-Name Accounting Standards Codification
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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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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-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
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 25
-Paragraph 4
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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