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Fair Value Measures - Schedule of Reconciliation for Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Investment in Unconsolidated Subsidiaries    
Beginning balance $ 265,531 $ 50,000
Net change in fair value 18,434 (28,434)
Transfer in   5,174
Purchases/ Additions   200,357
Ending balance 283,965 283,965
Other liabilities    
Beginning balance 0 0
Net change in fair value 10,700 10,700
Transfer in   0
Purchases/ Additions   0
Ending balance $ 10,700 $ 10,700