Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	$ 930		$ 7,730
Payments to acquire short-term investments	794,793	$ 0
Investments in U.S. Treasury bills	445,165		0
Proceeds from maturities of U.S. Treasury bills	349,461	$ 0
US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Payments to acquire short-term investments	794,793
Investments in U.S. Treasury bills	800,000
Proceeds from maturities of U.S. Treasury bills	350,000
Amortized cost, current	448,196
Recurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	930		7,730
Deferred compensation plan assets (included in restricted cash and other assets)	95,681		110,174
Loans receivable (included in investments in partially owned entities and in other assets)	53,251		50,182
Interest rate swaps and caps (included in other assets)	189,891		18,929
Total assets	784,918		187,015
Mandatorily redeemable instruments (included in other liabilities)	49,383		49,659
Interest rate swaps (included in other liabilities)			32,837
Total liabilities	49,383		82,496
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	445,165
Recurring \| Level 1
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	0		0
Deferred compensation plan assets (included in restricted cash and other assets)	50,770		65,158
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	495,935		65,158
Mandatorily redeemable instruments (included in other liabilities)	49,383		49,659
Interest rate swaps (included in other liabilities)			0
Total liabilities	49,383		49,659
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	445,165
Recurring \| Level 2
Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis
Real estate fund investments	0		0
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)	189,891		18,929
Total assets	189,891		18,929
Mandatorily redeemable instruments (included in other liabilities)	0		0
Interest rate swaps (included in other liabilities)			32,837
Total liabilities	0		32,837
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
Real estate fund investments	930		7,730
Deferred compensation plan assets (included in restricted cash and other assets)	44,911		45,016
Loans receivable (included in investments in partially owned entities and in other assets)	53,251		50,182
Interest rate swaps and caps (included in other assets)	0		0
Total assets	99,092		102,928
Mandatorily redeemable instruments (included in other liabilities)	0		0
Interest rate swaps (included in other liabilities)			0
Total liabilities	0		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)	6,434		9,104
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)	89,247		101,070
Loans receivable (included in investments in partially owned entities and in other assets)	4,024		3,738
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)	$ 49,227		$ 46,444

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.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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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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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 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.

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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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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are 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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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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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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