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Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
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 strike rate for limited settlement   2.78%
Investment in IQHQ $ 24,591 $ 12,500
Fair Value, Recurring | RET Ventures [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment in IQHQ [1] 4,497 2,293
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 swap rate period 5 years  
[1]

 

(1)

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