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Financial Assets and Liabilities - Level 3 Financial Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration]     Other, net  
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income [Extensible Enumeration]     Other, net  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 85,990 $ 79,031 $ 75,843 $ 81,805
Purchases 0 0 0 0
Total realized and unrealized gains / (losses) 2,262 8,567 12,409 5,793
Net Transfers into (out of) Level 3 0 0 0 0
Settlement 0 0 0 0
Ending balance 88,252 87,598 88,252 87,598
Change in net unrealized gains / (losses) on investments still held at end of period 2,262 8,567 12,409 5,793
Equity investment        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 85,990 79,031 75,843 81,805
Purchases 0 0 0 0
Total realized and unrealized gains / (losses) 2,262 8,567 12,409 5,793
Net Transfers into (out of) Level 3 0 0 0 0
Settlement 0 0 0 0
Ending balance 88,252 87,598 88,252 87,598
Change in net unrealized gains / (losses) on investments still held at end of period 2,262 8,567 12,409 5,793
Other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 0 0    
Purchases 0    
Total realized and unrealized gains / (losses) 0 0    
Net Transfers into (out of) Level 3 0 0    
Settlement 0    
Ending balance 0 0 $ 0 $ 0
Change in net unrealized gains / (losses) on investments still held at end of period $ 0 $ 0