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Summary of Significant Accounting Policies - Narratives (Details) - jointVenture				3 Months Ended
	Dec. 18, 2020	Jul. 31, 2020	Jul. 30, 2020	Mar. 31, 2021	Dec. 24, 2020	Jun. 05, 2019
Variable Interest Entity
Weighted average incremental borrowing rate				5.70%
Weighted average remaining lease term				31 years
Joint venture, blackstone property partners
Variable Interest Entity
Ownership interest (percent)				20.00%		20.00%
Joint Venture Sun Valley Property
Variable Interest Entity
Ownership interest (percent)				50.00%	50.00%
Hollywood Media Portfolio
Variable Interest Entity
VIE, ownership Interest		51.00%
Hollywood Media Portfolio | Disposed of by Sale
Variable Interest Entity
VIE, ownership Interest			49.00%
VIE, primary beneficiary
Variable Interest Entity
Number of joint ventures meeting VIE definition				14
Number of joint ventures consolidated				12
VIE, primary beneficiary | 1918 Eighth
Variable Interest Entity
VIE, ownership Interest	55.00%			55.00%
VIE, not primary beneficiary
Variable Interest Entity
Number of joint ventures not consolidated				2

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Variable Interest Entity, Number Of Joint Ventures Consolidated

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Weighted average discount rate for operating lease calculated at point in time.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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