Fair Value Measurements (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative, description of terms		. We receive a cash settlement in the future if the prevailing interest rate is higher than the 3% strike price on the five-year swap rate. Alternatively, if interest rates were to decrease below the specified strike price, we would not receive a cash settlement, nor would we have any requirement to make a payment	We receive a cash settlement in the future if the prevailing interest rate is higher than the 1.68% five-year swap strike price. The amount of future cash settlement is capped if the prevailing interest rate exceeds 2.78%. Alternatively, if interest rates were to decrease below the specified strike price, we would not receive a cash settlement, nor would we have any requirement to make a payment.
Derivative swap rate period		5 years
Impairment			$ 15,860
Fair Value, Recurring | Real Estate Technology Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment	[1]	$ 9,613	2,293
Fair Value Measurements Non-Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment		0	15,900	$ 0
Interest Rate Option [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Payments for purchase of swaption		5,600	12,100
Swaption, notional amount		$ 500,000	$ 1,500,000
Derivative strike rate		3.00%	1.68%
Derivative strike rate for limited settlement			2.78%

[1] Investments measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.