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Fair Value Measurement (Level 3 Assets and Liability) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 74,357 $ 83,776 $ 71,513 $ 57,565
Included in earnings, as a part of:        
Operating expense     0  
Included in other comprehensive income (loss)   (2,233) (740) (4,982)
Purchases 3,276 13,290 18,716 40,329
Sales (1,190) (1,867) (5,613) (5,206)
Transfers in   252 12,999 22,304
Transfers out (863) (26,064) (21,378) (42,180)
Ending balance 74,793 67,235 74,793 67,235
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end $ (153) $ 80 $ (893) $ (643)
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 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) $ (24,000) $ (15,000) $ (24,000)
Total gains (losses) realized and unrealized:        
Net investment income (loss)     1,000  
Included in other comprehensive income (loss)   0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3   0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0 0 0
Ending balance (9,500) (24,000) (9,500) (24,000)
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
Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings $ 46 1 (23) 2
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Investment Income      
Total gains (losses) realized and unrealized:        
Net investment gains (losses) $ 1,500 0 0 0
Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings (833) $ 80 $ (681) $ (597)
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) 0 $ 0 $ 4,500 $ 0
State and Municipal Bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   0   0
Included in earnings, as a part of:        
Included in other comprehensive income (loss)   (24)   (24)
Purchases   750   750
Sales   0   0
Transfers in   0   0
Transfers out   0   0
Ending balance   726   726
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end   0   0
State and Municipal Bonds | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings   0   0
State and Municipal Bonds | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings   0   0
Corporate Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 67,394 74,212 63,973 47,129
Included in earnings, as a part of:        
Operating expense     0  
Included in other comprehensive income (loss)   (2,057) (751) (4,369)
Purchases 1,236 9,204 11,642 27,702
Sales (1,188) (1,777) (5,215) (4,803)
Transfers in   0 11,220 18,828
Transfers out (863) (21,427) (15,098) (26,332)
Ending balance 65,960 58,154 65,960 58,154
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 income (loss)        
Included in earnings, as a part of:        
Included in earnings 199 (1) (23) (1)
Corporate Debt | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings (818) 0 212 0
Asset-backed Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,229 4,038 2,954 6,502
Included in earnings, as a part of:        
Operating expense     0  
Included in other comprehensive income (loss)   (152) 11 (589)
Purchases 0 2,819 1,863 9,877
Sales (2) (90) (398) (287)
Transfers in   0 1,779 570
Transfers out 0 (2,444) (4,997) (11,903)
Ending balance 1,212 4,173 1,212 4,173
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 income (loss)        
Included in earnings, as a part of:        
Included in earnings 0 2 0 3
Asset-backed Securities | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings (15) 0 0 0
Equity Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 5,234 4,625 2,803 2,500
Included in earnings, as a part of:        
Operating expense     0  
Included in other comprehensive income (loss)   0 0 0
Purchases 0 17 3,171 17
Sales 0 0 0 0
Transfers in   252 0 2,377
Transfers out 0 (2,193) 0 (2,193)
Ending balance 5,233 2,767 5,233 2,767
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end (1) 66 (741) 66
Equity Investments | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings (1) 0 0 0
Equity Investments | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings 0 66 (741) 66
Other Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 500 901 1,783 1,434
Included in earnings, as a part of:        
Operating expense     0  
Included in other comprehensive income (loss)   0 0 0
Purchases 2,040 500 2,040 1,983
Sales 0 0 0 (116)
Transfers in   0 0 529
Transfers out 0 0 (1,283) (1,752)
Ending balance 2,388 1,415 2,388 1,415
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets and liabilities held at period-end (152) 14 (152) (709)
Other Investments | Net investment income (loss)        
Included in earnings, as a part of:        
Included in earnings (152) 0 0 0
Other Investments | Net investment gains (losses)        
Included in earnings, as a part of:        
Included in earnings 0 14 (152) (663)
Other Liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (11,000) (24,000) (15,000) (24,000)
Total gains (losses) realized and unrealized:        
Net investment income (loss)     1,000  
Included in other comprehensive income (loss)   0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3   0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0 0 0
Ending balance (9,500) (24,000) (9,500) (24,000)
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
Other Liabilities | Net investment income (loss)        
Total gains (losses) realized and unrealized:        
Net investment gains (losses) 1,500 0 0 0
Other Liabilities | Net investment gains (losses)        
Total gains (losses) realized and unrealized:        
Net investment gains (losses) $ 0 $ 0 $ 4,500 $ 0