v3.24.3
Fair Value Measurement (Level 3 Assets and Liability) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 72,413 $ 74,357 $ 97,154 $ 71,513
Included in earnings, as a part of:        
Included in earnings   $ 46    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments      
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 Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Operating expense       $ 0
Included in other comprehensive income (loss) $ 95 $ (833) $ (71) (740)
Purchases 7,450 3,276 15,418 18,716
Sales (958) (1,190) (2,966) (5,613)
Transfers in 3,587   3,587 12,999
Transfers out 0 (863) (29,634) (21,378)
Ending balance 82,521 74,793 82,521 74,793
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end $ (68) $ (153) $ (979) $ (893)
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 held at period-end Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   $ (11,000) $ (6,500) $ (15,000)
Total gains (losses) realized and unrealized:        
Net investment gains (losses)   1,500    
Operating expense       1,000
Included in other comprehensive income (loss)   0 0 0
Purchases   0 0 0
Sales   0 0 0
Transfers in     0 0
Transfers out   0 0 0
Ending balance $ 0   0  
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   $ 0 0 0
Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings $ (68)   $ (969) $ (23)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments   Gain (Loss) on Investments Gain (Loss) on Investments
Total gains (losses) realized and unrealized:        
Net investment gains (losses)     $ 6,500 $ 0
Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings $ 2   $ 2 $ (681)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Net Investment Income Net Investment Income Net Investment Income
Total gains (losses) realized and unrealized:        
Net investment gains (losses)     $ 0 $ 4,500
Corporate Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 66,951 $ 67,394 82,377 63,973
Included in earnings, as a part of:        
Included in earnings   199    
Operating expense       0
Included in other comprehensive income (loss) 95 (818) (49) (751)
Purchases 5,133 1,236 11,901 11,642
Sales (958) (1,188) (2,497) (5,215)
Transfers in 3,587   3,587 11,220
Transfers out 0 (863) (20,511) (15,098)
Ending balance 74,808 65,960 74,808 65,960
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end 0 0 0 0
Corporate Debt | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings 0   0 (23)
Corporate Debt | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings 0   0 212
Asset-backed Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 724 1,229 4,414 2,954
Included in earnings, as a part of:        
Included in earnings   0    
Operating expense       0
Included in other comprehensive income (loss) 0 (15) (22) 11
Purchases 1,998 0 3,198 1,863
Sales 0 (2) (217) (398)
Transfers in 0   0 1,779
Transfers out 0 0 (4,651) (4,997)
Ending balance 2,724 1,212 2,724 1,212
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end 0 0 0 0
Asset-backed Securities | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings 0   0 0
Asset-backed Securities | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings 2   2 0
Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 4,238 5,234 5,237 2,803
Included in earnings, as a part of:        
Included in earnings   (1)    
Operating expense       0
Included in other comprehensive income (loss) 0 0 0 0
Purchases 319 0 319 3,171
Sales 0 0 0 0
Transfers in 0   0 0
Transfers out 0 0 0 0
Ending balance 4,489 5,233 4,489 5,233
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end (68) (1) (1,067) (741)
Equity Investments | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings (68)   (1,067) 0
Equity Investments | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings 0   0 (741)
Other Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 500 500 5,126 1,783
Included in earnings, as a part of:        
Included in earnings   (152)    
Operating expense       0
Included in other comprehensive income (loss) 0 0 0 0
Purchases 0 2,040 0 2,040
Sales 0 0 (252) 0
Transfers in 0   0 0
Transfers out 0 0 (4,472) (1,283)
Ending balance 500 2,388 500 2,388
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end 0 (152) 88 (152)
Other Investments | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings 0   98 0
Other Investments | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings 0   0 (152)
Other Liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   (11,000) (6,500) (15,000)
Total gains (losses) realized and unrealized:        
Net investment gains (losses)   1,500    
Operating expense       1,000
Included in other comprehensive income (loss)   0 0 0
Purchases   0 0 0
Sales   0 0
Transfers in     0 0
Transfers out   0 0 0
Ending balance $ 0 (9,500) 0 (9,500)
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   $ 0 0 0
Other Liabilities | Net investment gains (losses)        
Total gains (losses) realized and unrealized:        
Net investment gains (losses)     6,500 0
Other Liabilities | Net investment income (loss)        
Total gains (losses) realized and unrealized:        
Net investment gains (losses)     $ 0 $ 4,500