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Financial Assets and Liabilities - Level 3 financial instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
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 $ 84,587 $ 79,726 $ 81,805 $ 76,613
Purchases 0 0 0 0
Total Realized and Unrealized Gains / (Losses) (5,556) (8,667) (2,774) (5,554)
Net Transfers into (out of) Level 3 0 0 0 0
Settlement 0 0 0 0
Ending balance 79,031 71,059 79,031 71,059
Change in Net Unrealized Gains / (Losses) on Investments still held at End of Period (5,556) (8,667) (2,774) (5,554)
Equity investment        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 84,587 79,726 81,805 76,613
Purchases 0 0 0 0
Total Realized and Unrealized Gains / (Losses) (5,556) (8,667) (2,774) (5,554)
Net Transfers into (out of) Level 3 0 0 0 0
Settlement 0 0 0 0
Ending balance 79,031 71,059 79,031 71,059
Change in Net Unrealized Gains / (Losses) on Investments still held at End of Period (5,556) (8,667) (2,774) (5,554)
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