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Investments - Securities In Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 1,468,423 | $ 300,911
12 Months or Greater - Fair Value | 40,914 | 80,269
Total - Fair Value | 1,509,337 | 381,180
Less Than 12 Months - Unrealized Losses | (32,408) | (3,827)
12 Months or Greater - Unrealized Losses | (1,395) | (832)
Total - Unrealized Losses | (33,803) | (4,659)
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 57,006 | 2,690
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 57,006 | 2,690
Less Than 12 Months - Unrealized Losses | (222) | (2)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (222) | (2)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 522,476 | 31,416
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 522,476 | 31,416
Less Than 12 Months - Unrealized Losses | (14,727) | (256)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (14,727) | (256)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 580,879 | 44,968
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 580,879 | 44,968
Less Than 12 Months - Unrealized Losses | (14,990) | (1,728)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (14,990) | (1,728)
ABS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 50,656 | 14,929
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 50,656 | 14,929
Less Than 12 Months - Unrealized Losses | (222) | (18)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (222) | (18)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 127,663 | 98,409
12 Months or Greater - Fair Value | 3,254 | 3,566
Total - Fair Value | 130,917 | 101,975
Less Than 12 Months - Unrealized Losses | (1,387) | (773)
12 Months or Greater - Unrealized Losses | (23) | (65)
Total - Unrealized Losses | (1,410) | (838)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 70,193 | 13,212
12 Months or Greater - Fair Value | 13,150 | 2,799
Total - Fair Value | 83,343 | 16,011
Less Than 12 Months - Unrealized Losses | (749) | (789)
12 Months or Greater - Unrealized Losses | (1,331) | (336)
Total - Unrealized Losses | (2,080) | (1,125)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 55,161 | 95,287
12 Months or Greater - Fair Value | 24,510 | 73,904
Total - Fair Value | 79,671 | 169,191
Less Than 12 Months - Unrealized Losses | (15) | (261)
12 Months or Greater - Unrealized Losses | (41) | (431)
Total - Unrealized Losses | (56) | $ (692)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 4,389 |
12 Months or Greater - Fair Value | 0 |
Total - Fair Value | 4,389 |
Less Than 12 Months - Unrealized Losses | (96) |
12 Months or Greater - Unrealized Losses | 0 |
Total - Unrealized Losses | $ (96) |

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