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Prepaid Expenses and Other Assets, net - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investment Holdings
Unrealized gain (loss) on non-real estate investments	$ 5,018,000	$ (2,267,000)	$ 10,793,000	$ (2,848,000)
Gain (loss) recognized on stock purchase warrant	(100,000)	0	1,800,000	0
Non Real Estate Investment That Does Not Report NAV
Investment Holdings
Unrealized gain (loss) on non-real estate investments	$ 5,100,000	$ (700,000)	$ 9,000,000.0	$ (1,200,000)

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- Definition

Recognized Gain (Loss) On Stock Purchase Warrant

+ References

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- Definition

Amount of unrealized gain (loss) on investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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