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Investments (Available-for-sale allowance for credit losses roll forward) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance $ 37,599 $ 8,781 $ 9,724 $ 3,969  
Current provision for securities without prior allowance 9,677 155 31,965 3,820  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   8,318    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 5,842 (2,427) 5,605 (1,102)  
Reductions for securities sold (2,213) (437) (3,608) (615)  
Reductions for securities identified as intent (or requirement) to sell during the period (105) (61) (1,204) (61)  
Allowance for credit losses, Period ending balance 50,800 6,011 50,800 6,011  
Accrued investment income 50,371   50,371   $ 48,247
Available-for-sale Securities | Foreign Government [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance 150 56 46 1  
Current provision for securities without prior allowance 117 0 236 49  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   0    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 12 (7) (3) (1)  
Reductions for securities sold (14) 0 (14) 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Allowance for credit losses, Period ending balance 265 49 265 49  
Available-for-sale Securities | Obligations of States and Political Subdivisions [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance 1,991 201 137 4  
Current provision for securities without prior allowance 534 0 1,237 25  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   0    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (1,166) (163) (4) 9  
Reductions for securities sold (153) 0 (164) 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Allowance for credit losses, Period ending balance 1,206 38 1,206 38  
Available-for-sale Securities | Corporate Securities [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance 23,066 6,166 6,682 2,782  
Current provision for securities without prior allowance 8,323 148 28,243 2,185  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   0    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 5,732 (2,403) 4,542 (909)  
Reductions for securities sold (1,944) (373) (3,191) (520)  
Reductions for securities identified as intent (or requirement) to sell during the period (105) (61) (1,204) (61)  
Allowance for credit losses, Period ending balance 35,072 3,477 35,072 3,477  
Available-for-sale Securities | Collateralized Loan Obligations and Other Asset Backed Securities [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance 2,283 1,470 939 592  
Current provision for securities without prior allowance 530 0 2,058 941  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   0    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 819 (70) 637 (116)  
Reductions for securities sold (9) (1) (11) (18)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Allowance for credit losses, Period ending balance 3,623 1,399 3,623 1,399  
Available-for-sale Securities | Residential Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance 10,029 864 1,909 561  
Current provision for securities without prior allowance 173 3 174 618  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   8,318    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 507 230 443 (68)  
Reductions for securities sold (93) (63) (228) (77)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Allowance for credit losses, Period ending balance 10,616 1,034 10,616 1,034  
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Allowance for credit losses, Period beginning balance 80 24 11 29  
Current provision for securities without prior allowance 0 4 17 2  
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0   0    
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (62) (14) (10) (17)  
Reductions for securities sold 0 0 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0 0 0  
Allowance for credit losses, Period ending balance 18 $ 14 18 $ 14  
Available-for-sale Securities [Member]          
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]          
Accrued investment income $ 49,100   $ 49,100   $ 46,300