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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 [2]
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value $ 5,735,135 $ 2,992,944  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (51,758) (122,908)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 2,072,853 2,771,976  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] (63,458) (192,689)  
Available for sale, continuous unrealized loss position, total, fair value 7,807,988 5,764,920  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (115,216) (315,597)  
Fixed maturity securities, available for sale, allowance for credit losses 2,846 64,771 $ 0
United States Government Full Faith and Credit      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 1,007    
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (34)    
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0    
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] 0    
Available for sale, continuous unrealized loss position, total, fair value 1,007    
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (34)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
United States Government Sponsored Agencies      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 759,970 250,475  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (90) (46)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0 0  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] 0 0  
Available for sale, continuous unrealized loss position, total, fair value 759,970 250,475  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (90) (46)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
United States Municipalities, States and Territories      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 168,942 31,802  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (2,468) (3,887)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 15,711 868  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] (3,350) (1)  
Available for sale, continuous unrealized loss position, total, fair value 184,653 32,670  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (5,818) (3,888)  
Fixed maturity securities, available for sale, allowance for credit losses 2,776 2,844 0
Foreign Government Obligations      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 42,861    
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (843)    
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0    
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] 0    
Available for sale, continuous unrealized loss position, total, fair value 42,861    
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (843)    
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 2,375,603 606,277  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (30,070) (45,150)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 116,819 154,633  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] (8,372) (50,935)  
Available for sale, continuous unrealized loss position, total, fair value 2,492,422 760,910  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (38,442) (96,085)  
Fixed maturity securities, available for sale, allowance for credit losses 0 60,193 0
Residential Mortgage Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 250,964 156,016  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (1,408) (2,384)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 26,917 13,599  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] (755) (1,876)  
Available for sale, continuous unrealized loss position, total, fair value 277,881 169,615  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (2,163) (4,260)  
Fixed maturity securities, available for sale, allowance for credit losses 70 1,734 0
Commercial Mortgage Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 784,464 934,593  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (5,500) (54,834)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 142,224 35,153  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] (12,219) (9,844)  
Available for sale, continuous unrealized loss position, total, fair value 926,688 969,746  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (17,719) (64,678)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0
Other Asset Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 1,351,324 1,013,781  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses [1] (11,345) (16,607)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 1,771,182 2,567,723  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses [1] (38,762) (130,033)  
Available for sale, continuous unrealized loss position, total, fair value 3,122,506 3,581,504  
Available for sale, continuous unrealized loss position, total, unrealized losses [1] (50,107) (146,640)  
Fixed maturity securities, available for sale, allowance for credit losses $ 0 $ 0 $ 0
[1] Unrealized losses have not been reduced to reflect the allowance for credit losses of $2.8 million and $64.8 million as of December 31, 2021 and 2020, respectively.
[2] The allowance for credit loss associated with available for sale fixed maturity securities was applied prospectively upon adoption of authoritative guidance effective January 1, 2020. See Note 1 - Significant Accounting Policies for further details.