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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
 [2]
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value $ 2,992,944   $ 3,259,219
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (122,908) [1]   (59,699)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 2,771,976   4,448,519
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (192,689) [1]   (232,356)
Available for sale, continuous unrealized loss position, total, fair value 5,764,920   7,707,738
Available for sale, continuous unrealized loss position, total, unrealized losses (315,597) [1]   (292,055)
Fixed maturity securities, available for sale, allowance for credit losses 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     144,582
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses     (96)
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     0
Available for sale, continuous unrealized loss position, total, fair value     144,582
Available for sale, continuous unrealized loss position, total, unrealized losses     (96)
Fixed maturity securities, available for sale, allowance for credit losses 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 250,475   168,732
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (46) [1]   (1,229)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0   201,444
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses 0 [1]   (3,556)
Available for sale, continuous unrealized loss position, total, fair value 250,475   370,176
Available for sale, continuous unrealized loss position, total, unrealized losses (46) [1]   (4,785)
Fixed maturity securities, available for sale, allowance for credit losses 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 31,802   285,481
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (3,887) [1]   (8,173)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 868   3,081
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (1) [1]   (77)
Available for sale, continuous unrealized loss position, total, fair value 32,670   288,562
Available for sale, continuous unrealized loss position, total, unrealized losses (3,888) [1]   (8,250)
Fixed maturity securities, available for sale, allowance for credit losses 2,844 0  
Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, allowance for credit losses 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 156,016   212,404
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (2,384) [1]   (2,686)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 13,599   11,332
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (1,876) [1]   (1,005)
Available for sale, continuous unrealized loss position, total, fair value 169,615   223,736
Available for sale, continuous unrealized loss position, total, unrealized losses (4,260) [1]   (3,691)
Fixed maturity securities, available for sale, allowance for credit losses 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 934,593   602,394
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (54,834) [1]   (9,366)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 35,153   194,328
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (9,844) [1]   (4,417)
Available for sale, continuous unrealized loss position, total, fair value 969,746   796,722
Available for sale, continuous unrealized loss position, total, unrealized losses (64,678) [1]   (13,783)
Fixed maturity securities, available for sale, allowance for credit losses 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 1,013,781   752,413
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (16,607) [1]   (11,709)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 2,567,723   3,375,016
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (130,033) [1]   (167,482)
Available for sale, continuous unrealized loss position, total, fair value 3,581,504   4,127,429
Available for sale, continuous unrealized loss position, total, unrealized losses (146,640) [1]   (179,191)
Fixed maturity securities, available for sale, allowance for credit losses 0 $ 0  
Finance, Insurance and Real Estate | Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 109,789   267,521
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (1,733) [1]   (4,785)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0   121,993
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses 0 [1]   (4,744)
Available for sale, continuous unrealized loss position, total, fair value 109,789   389,514
Available for sale, continuous unrealized loss position, total, unrealized losses (1,733) [1]   (9,529)
Manufacturing, Construction and Mining | Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 0   161,633
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses 0 [1]   (6,039)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 19,335   44,606
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (1,384) [1]   (3,951)
Available for sale, continuous unrealized loss position, total, fair value 19,335   206,239
Available for sale, continuous unrealized loss position, total, unrealized losses (1,384) [1]   (9,990)
Utilities and Related Sectors | Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 310,823   334,635
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (27,509) [1]   (7,730)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 35,408   51,269
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (3,628) [1]   (3,482)
Available for sale, continuous unrealized loss position, total, fair value 346,231   385,904
Available for sale, continuous unrealized loss position, total, unrealized losses (31,137) [1]   (11,212)
Wholesale/Retail Trade | Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 65,567   54,289
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (4,344) [1]   (1,751)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 16,000   129,364
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (26) [1]   (9,411)
Available for sale, continuous unrealized loss position, total, fair value 81,567   183,653
Available for sale, continuous unrealized loss position, total, unrealized losses (4,370) [1]   (11,162)
Services, Media and Other | Corporate Securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, continuous unrealized loss position, less than 12 months, fair value 120,098   275,135
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (11,564) [1]   (6,135)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 83,890   316,086
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (45,897) [1]   (34,231)
Available for sale, continuous unrealized loss position, total, fair value 203,988   591,221
Available for sale, continuous unrealized loss position, total, unrealized losses $ (57,461) [1]   $ (40,366)
[1] (1) Unrealized losses have not been reduced to reflect the allowance for credit losses of $64.8 million as of December 31, 2020.
[2] (1) 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.