Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate fund investments	$ 0	$ 7,730
Purchase of U.S. Treasury bills	1,066,096	0	$ 0
Investments in U.S. Treasury bills	471,962	0
Proceeds from maturities of U.S. Treasury bills	597,499	0	$ 0
US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Purchase of U.S. Treasury bills	1,066,096
Investments in U.S. Treasury bills	1,077,000
Proceeds from maturities of U.S. Treasury bills	600,000
Amortized cost, current	473,171
Recurring
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate fund investments		7,730
Deferred compensation plan assets (included in restricted cash and other assets)	96,322	110,174
Loans receivable (included in investments in partially owned entities and in other assets)	54,397	50,182
Interest rate swaps and caps (included in other assets)	183,804	18,929
Total assets	806,485	187,015
Mandatorily redeemable instruments (included in other liabilities)	49,383	49,659
Interest rate swaps (included in other liabilities)		32,837
Total liabilities		82,496
Recurring \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Investments in U.S. Treasury bills	471,962
Recurring \| Level 1
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate fund investments		0
Deferred compensation plan assets (included in restricted cash and other assets)	57,406	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	529,368	65,158
Mandatorily redeemable instruments (included in other liabilities)	49,383	49,659
Interest rate swaps (included in other liabilities)		0
Total liabilities		49,659
Recurring \| Level 1 \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Investments in U.S. Treasury bills	471,962
Recurring \| Level 2
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate fund investments		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)	183,804	18,929
Total assets	183,804	18,929
Mandatorily redeemable instruments (included in other liabilities)	0	0
Interest rate swaps (included in other liabilities)		32,837
Total liabilities		32,837
Recurring \| Level 2 \| US Treasury Bill Securities
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Investments in U.S. Treasury bills	0
Recurring \| Level 3
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Real estate fund investments		7,730
Deferred compensation plan assets (included in restricted cash and other assets)	38,916	45,016
Loans receivable (included in investments in partially owned entities and in other assets)	54,397	50,182
Interest rate swaps and caps (included in other assets)	0	0
Total assets	93,313	102,928
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 Nonrecurring Basis
Investments in U.S. Treasury bills	0
Restricted Cash \| Recurring
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	7,763	9,104
Other Assets \| Recurring
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Deferred compensation plan assets (included in restricted cash and other assets)	88,559	101,070
Loans receivable (included in investments in partially owned entities and in other assets)	4,306	3,738
Partially Owned Properties \| Recurring
Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
Loans receivable (included in investments in partially owned entities and in other assets)	$ 50,091	$ 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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This element represents the real estate assets related to the fund

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