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Prepaid Expenses and Other Assets, net - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investment Holdings
Unrealized gain (loss) on non-real estate investments	$ 827,000	$ 513,000	$ 11,620,000	$ (2,335,000)
Gain (loss) recognized on stock purchase warrant	(200,000)	0	1,700,000	0
Non Real Estate Investment That Does Not Report NAV
Investment Holdings
Unrealized gain (loss) on non-real estate investments	$ 1,000,000	$ 500,000	$ 9,900,000	$ (2,300,000)

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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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