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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | [2] | Jan. 01, 2020 | [2] | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | $ 6,103,273 |  |  |  | $ 3,259,219
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (414,874) | [1] |  |  | (59,699)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 3,226,303 |  |  |  | 4,448,519
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (390,656) | [1] |  |  | (232,356)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 9,329,576 |  |  |  | 7,707,738
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (805,530) | [1] |  |  | (292,055)
Fixed maturity securities, available for sale, allowance for credit losses |  | 61,619 |  | $ 50,186 | $ 0 |
United States Government Full Faith and Credit |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  |  |  |  |  | 144,582
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  |  |  |  |  | (96)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  |  |  |  |  | 0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  |  |  |  |  | 0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  |  |  |  |  | 144,582
Fixed maturity securities, available for sale securities, 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] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 800,010 |  |  |  | 168,732
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (672) | [1] |  |  | (1,229)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  |  |  | 201,444
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | 0 | [1] |  |  | (3,556)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 800,010 |  |  |  | 370,176
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (672) | [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] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 39,734 |  |  |  | 285,481
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (5,865) | [1] |  |  | (8,173)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 436 |  |  |  | 3,081
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (1) | [1] |  |  | (77)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 40,170 |  |  |  | 288,562
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (5,866) | [1] |  |  | (8,250)
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  |  |  |
Foreign Government Obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 13,782 |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (408) |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | 0 |  |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 13,782 |  |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (408) |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 |  |  |  |
Corporate Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 53,045 |  | 46,749 | 0 |
Corporate Securities | Finance, Insurance and Real Estate Sectors |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 325,056 |  |  |  | 267,521
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (12,818) | [1] |  |  | (4,785)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  |  |  | 121,993
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | 0 | [1] |  |  | (4,744)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 325,056 |  |  |  | 389,514
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (12,818) | [1] |  |  | (9,529)
Corporate Securities | Manufacturing, Construction and Mining |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 131,180 |  |  |  | 161,633
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (8,185) | [1] |  |  | (6,039)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 19,391 |  |  |  | 44,606
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (1,734) | [1] |  |  | (3,951)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 150,571 |  |  |  | 206,239
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (9,919) | [1] |  |  | (9,990)
Corporate Securities | Utilities and Related Sectors |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 409,451 |  |  |  | 334,635
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (57,131) | [1] |  |  | (7,730)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 38,992 |  |  |  | 51,269
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (6,719) | [1] |  |  | (3,482)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 448,443 |  |  |  | 385,904
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (63,850) | [1] |  |  | (11,212)
Corporate Securities | Wholesale/Retail Trade |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 168,634 |  |  |  | 54,289
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (16,412) | [1] |  |  | (1,751)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 81,245 |  |  |  | 129,364
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (17,821) | [1] |  |  | (9,411)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 249,879 |  |  |  | 183,653
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (34,233) | [1] |  |  | (11,162)
Corporate Securities | Services, Media and Other |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 404,680 |  |  |  | 275,135
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (52,252) | [1] |  |  | (6,135)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 230,903 |  |  |  | 316,086
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (61,600) | [1] |  |  | (34,231)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 635,583 |  |  |  | 591,221
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (113,852) | [1] |  |  | (40,366)
Residential Mortgage Backed Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 208,953 |  |  |  | 212,404
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (3,200) | [1] |  |  | (2,686)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 11,884 |  |  |  | 11,332
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (1,788) | [1] |  |  | (1,005)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 220,837 |  |  |  | 223,736
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (4,988) | [1] |  |  | (3,691)
Fixed maturity securities, available for sale, allowance for credit losses |  | 1,221 |  | 777 | 0 |
Commercial Mortgage Backed Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 1,954,977 |  |  |  | 602,394
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (193,626) | [1] |  |  | (9,366)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 67,940 |  |  |  | 194,328
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (16,450) | [1] |  |  | (4,417)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 2,022,917 |  |  |  | 796,722
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (210,076) | [1] |  |  | (13,783)
Fixed maturity securities, available for sale, allowance for credit losses |  | 7,353 |  | 2,660 | 0 |
Other Asset Backed Securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 1,646,816 |  |  |  | 752,413
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (64,305) | [1] |  |  | (11,709)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,775,512 |  |  |  | 3,375,016
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (284,543) | [1] |  |  | (167,482)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 4,422,328 |  |  |  | 4,127,429
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (348,848) | [1] |  |  | $ (179,191)
Fixed maturity securities, available for sale, allowance for credit losses |  | $ 0 |  | $ 0 | $ 0 |
[1] | (1) Unrealized losses have not been reduced to reflect the allowance for credit losses of $61.6 million as of September 30, 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 for further details.

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