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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost $ 6,065,554 $ 6,065,554 $ 5,879,986
Allowance for credit losses, Period beginning balance 15,787 0  
Allowance for credit losses, ending balance at June 30, 2020 10,395 10,395  
Interest and dividends due or accrued 45,793 45,793 44,846
Current provision for securities without prior allowance 863 10,930  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (5,720) 0  
Reductions for securities sold (468) (468)  
Reductions for securities identified as intent (or requirement) to sell during the period (67) (67)  
Unrealized Gains 342,901 342,901 223,372
Unrealized Losses (39,904) (39,904) (7,738)
Debt Securities, Available-for-sale 6,358,156 6,358,156 6,095,620
AFS Fixed Income Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividends due or accrued 44,700 44,700  
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 112,341 112,341 112,680
Allowance for credit losses, ending balance at June 30, 2020 0 0  
Unrealized Gains 7,382 7,382 3,506
Unrealized Losses 0 0 0
Debt Securities, Available-for-sale 119,723 119,723 116,186
AFS Fixed Income Securities [Member] | Foreign Government [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 16,936 16,936 18,011
Allowance for credit losses, Period beginning balance 21 0  
Allowance for credit losses, ending balance at June 30, 2020 28 28  
Current provision for securities without prior allowance 0 28  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 7 0  
Reductions for securities sold 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Unrealized Gains 1,118 1,118 533
Unrealized Losses (104) (104) (2)
Debt Securities, Available-for-sale 17,922 17,922 18,542
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 1,131,597 1,131,597 1,168,185
Allowance for credit losses, Period beginning balance 29 0  
Allowance for credit losses, ending balance at June 30, 2020 17 17  
Current provision for securities without prior allowance 15 17  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (27) 0  
Reductions for securities sold 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Unrealized Gains 72,034 72,034 62,175
Unrealized Losses (200) (200) (270)
Debt Securities, Available-for-sale 1,203,414 1,203,414 1,230,090
AFS Fixed Income Securities [Member] | Corporate Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 2,131,707 2,131,707 1,866,881
Allowance for credit losses, Period beginning balance 13,412 0  
Allowance for credit losses, ending balance at June 30, 2020 8,077 8,077  
Current provision for securities without prior allowance 813 8,539  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (5,686) 0  
Reductions for securities sold (395) (395)  
Reductions for securities identified as intent (or requirement) to sell during the period (67) (67)  
Unrealized Gains 142,677 142,677 81,906
Unrealized Losses (10,302) (10,302) (1,310)
Debt Securities, Available-for-sale 2,256,005 2,256,005 1,947,477
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 853,470 853,470 790,517
Allowance for credit losses, Period beginning balance 1,565 0  
Allowance for credit losses, ending balance at June 30, 2020 1,389 1,389  
Current provision for securities without prior allowance 27 1,447  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities (145) 0  
Reductions for securities sold (58) (58)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Unrealized Gains 11,946 11,946 7,929
Unrealized Losses (24,506) (24,506) (5,434)
Debt Securities, Available-for-sale 839,521 839,521 793,012
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 1,254,472 1,254,472 1,409,003
Allowance for credit losses, Period beginning balance 722 0  
Allowance for credit losses, ending balance at June 30, 2020 831 831  
Current provision for securities without prior allowance 0 846  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 124 0  
Reductions for securities sold (15) (15)  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Unrealized Gains 65,745 65,745 43,421
Unrealized Losses (1,008) (1,008) (455)
Debt Securities, Available-for-sale 1,318,378 1,318,378 1,451,969
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Cost/Amortized Cost 565,031 565,031 514,709
Allowance for credit losses, Period beginning balance 38 0  
Allowance for credit losses, ending balance at June 30, 2020 53 53  
Current provision for securities without prior allowance 8 53  
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities 7 0  
Reductions for securities sold 0 0  
Reductions for securities identified as intent (or requirement) to sell during the period 0 0  
Unrealized Gains 41,999 41,999 23,902
Unrealized Losses (3,784) (3,784) (267)
Debt Securities, Available-for-sale $ 603,193 $ 603,193 $ 538,344