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Fair Value Measurements (Reconciliation of Beginning and Ending Balances of Level 3 Measurements) (Details) - Level 3 - Convertible preferred securities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2023
Reconciliation of Fair Value Measurements Using Level 3            
Asset, beginning balance $ 15,625 $ 15,625 $ 15,625 $ 15,424 $ 15,410 $ 16,278
Gains included in Other income, net 0   0 4,919 (221) 802
Reclassification to a receivable in Other assets, net 0     (822)    
Proceeds from investments     0     (1,670)
Purchases of additional investments 100 0   1,107 235  
Asset, ending balance $ 15,725 $ 15,625 $ 15,625 $ 20,628 $ 15,424 $ 20,628