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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of mortgage and other indebtedness		$ 2,756,633	$ 2,970,246
Available-for-sale securities - at fair value (amortized cost of $151,762 in 2020)	[1]	151,795
Available-for-sale securities, fair value		151,762
U.S Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities - at fair value (amortized cost of $151,762 in 2020)		151,762
Available-For-Sale Securities Held, unrealized gains/(losses)		33
Available-for-sale securities, fair value		$ 151,795
[1] As of September 30, 2020, includes $364,893 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $171,625 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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No definition available.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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