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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
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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.

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