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Investment Funds and Equity Method Investments - Investment in Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity method investments	$ 1,065		$ 1,065		$ 1,189
Expense recognized	$ 25	$ 50	$ 128	$ 127

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- Definition

Equity Method Investments Venture Investments, Investment Position, Net Asset (Liability)

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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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