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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
Asset-Backed Securities [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance $ 2,179
Realized gains/(losses) 6
Redemptions (61)
Net change (55)
Ending Balance 2,124
Syndicated Loans [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance 69,888
Unrealized gains/(losses) 108
Realized gains/(losses) (134)
Purchases 31,365
Sales (2,103)
Redemptions (5,533)
Net change 23,703
Ending Balance 93,591
Corporate Equity Securities [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance 11,878
Net change 0
Ending Balance 11,878
Auction Rate Securities [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance 14,681
Unrealized gains/(losses) (1)
Net change (1)
Ending Balance 14,680
Other Investment [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance 36,974
Unrealized gains/(losses) 394
Net change 394
Ending Balance $ 37,368