v3.26.3
Fair Value Of Financial Instruments (Schedule of Changes in Fair Value Associated with Level 3 Financial Instruments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2026
Asset-Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 500 $ 4,040
Unrealized gains/(losses) 0 (534)
Realized losses 0 (2)
Sales 0 (3,004)
Net change 0 (3,540)
Ending Balance 500 500
Corporate Equity Securities Financial Instruments Owned [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 104 114
Unrealized gains/(losses) 6 12
Realized losses 0 (10)
Sales 0 (104)
Transfers into Level 3 0 98
Net change 6 (4)
Ending Balance 110 110
Syndicated Loans [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 67,903 56,898
Unrealized gains/(losses) (1,018) (1,042)
Realized losses 0 (3)
Purchases 1,899 43,473
Sales 0 (1,369)
Redemptions (6,753) (35,926)
Net change (5,872) 5,133
Ending Balance 62,031 62,031
Corporate Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 19,136 19,446
Unrealized gains/(losses) (12) (977)
Purchases 0 655
Net change (12) (322)
Ending Balance 19,124 19,124
Auction Rate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 184 551
Unrealized gains/(losses) 0 8
Realized losses 0 (7)
Sales 0 (368)
Net change 0 (367)
Ending Balance 184 184
Other Investment [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 14,905 13,560
Unrealized gains/(losses) 0 1,345
Net change 0 1,345
Ending Balance $ 14,905 $ 14,905