v3.26.1
Fair Value Measurement (Schedule of Fair Value Measurements - Level 3 Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:    
Beginning balance $ 83,015 $ 90,842
Included in earnings, as a part of:    
Included in earnings $ 27 $ (2,416)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
Included in other comprehensive income (loss) $ (510) $ 397
Purchases 6,331 2,070
Sales (1,277) (2,538)
Transfers in 3,562 2,989
Transfers out (1,919) (11,986)
Ending balance $ 89,229 79,358
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   $ (689)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag   Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end
Corporate Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:    
Beginning balance $ 79,511 $ 81,062
Included in earnings, as a part of:    
Included in earnings 27 (1,727)
Included in other comprehensive income (loss) (448) 417
Purchases 6,331 683
Sales (1,277) (2,538)
Transfers in 1,658 1,988
Transfers out (1,919) (10,938)
Ending balance 83,883 68,947
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   0
Asset-backed Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:    
Beginning balance 3,504 3,774
Included in earnings, as a part of:    
Included in earnings 0 0
Included in other comprehensive income (loss) (62) (20)
Purchases 0 866
Sales 0 0
Transfers in 1,904 1,001
Transfers out 0 (1,048)
Ending balance $ 5,346 4,573
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   0
Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:    
Beginning balance   5,506
Included in earnings, as a part of:    
Included in earnings   (689)
Included in other comprehensive income (loss)   0
Purchases   0
Sales   0
Transfers in   0
Transfers out   0
Ending balance   4,817
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   (689)
Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:    
Beginning balance   500
Included in earnings, as a part of:    
Included in earnings   0
Included in other comprehensive income (loss)   0
Purchases   521
Sales   0
Transfers in   0
Transfers out   0
Ending balance   1,021
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   $ 0