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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 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 |  | $ 7,289,479 |  |  |  | $ 3,259,219
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (567,058) | [1] |  |  | (59,699)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 3,174,156 |  |  |  | 4,448,519
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (470,819) | [1] |  |  | (232,356)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 10,463,635 |  |  |  | 7,707,738
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (1,037,877) | [1] |  |  | (292,055)
Fixed maturity securities, available for sale, allowance for credit losses |  | 50,186 |  | $ 28,332 | $ 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 |  |  |  |  |  | 168,732
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  |  |  |  |  | (1,229)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  |  |  |  |  | 201,444
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  |  |  |  |  | (3,556)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  |  |  |  |  | 370,176
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  |  |  |  |  | (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 |  | 51,931 |  |  |  | 285,481
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (2,039) | [1] |  |  | (8,173)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  |  |  | 3,081
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | 0 | [1] |  |  | (77)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 51,931 |  |  |  | 288,562
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (2,039) | [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 |  | 23,057 |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,128) |  |  |  |
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 |  | 23,057 |  |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (1,128) |  |  |  |
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 |  | 46,749 |  | 28,332 | 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 |  | 626,564 |  |  |  | 267,521
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (23,749) | [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 |  | 626,564 |  |  |  | 389,514
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (23,749) | [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 |  | 280,272 |  |  |  | 161,633
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (12,977) | [1] |  |  | (6,039)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 18,451 |  |  |  | 44,606
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (2,678) | [1] |  |  | (3,951)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 298,723 |  |  |  | 206,239
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (15,655) | [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 |  | 457,237 |  |  |  | 334,635
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (62,364) | [1] |  |  | (7,730)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 37,346 |  |  |  | 51,269
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (9,405) | [1] |  |  | (3,482)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 494,583 |  |  |  | 385,904
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (71,769) | [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 |  | 185,882 |  |  |  | 54,289
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (21,316) | [1] |  |  | (1,751)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 105,576 |  |  |  | 129,364
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (27,228) | [1] |  |  | (9,411)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 291,458 |  |  |  | 183,653
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (48,544) | [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 |  | 570,547 |  |  |  | 275,135
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (64,840) | [1] |  |  | (6,135)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 234,595 |  |  |  | 316,086
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (69,039) | [1] |  |  | (34,231)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 805,142 |  |  |  | 591,221
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (133,879) | [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 |  | 221,327 |  |  |  | 212,404
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (3,882) | [1] |  |  | (2,686)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 12,675 |  |  |  | 11,332
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (1,732) | [1] |  |  | (1,005)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 234,002 |  |  |  | 223,736
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (5,614) | [1] |  |  | (3,691)
Fixed maturity securities, available for sale, allowance for credit losses |  | 777 |  | 0 | 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 |  | 2,711,400 |  |  |  | 602,394
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (249,494) | [1] |  |  | (9,366)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 88,303 |  |  |  | 194,328
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (20,115) | [1] |  |  | (4,417)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 2,799,703 |  |  |  | 796,722
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (269,609) | [1] |  |  | (13,783)
Fixed maturity securities, available for sale, allowance for credit losses |  | 2,660 |  | 0 | 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 |  | 2,161,262 |  |  |  | 752,413
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | (125,269) | [1] |  |  | (11,709)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,677,210 |  |  |  | 3,375,016
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (340,622) | [1] |  |  | (167,482)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 4,838,472 |  |  |  | 4,127,429
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (465,891) | [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 $50.2 million as of June 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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