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Investments - Securities In Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 1,045,439 | $ 300,911
12 Months or Greater - Fair Value | 36,029 | 80,269
Total - Fair Value | 1,081,468 | 381,180
Less Than 12 Months - Unrealized Losses | (11,473) | (3,827)
12 Months or Greater - Unrealized Losses | (231) | (832)
Total - Unrealized Losses | (11,704) | (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 | 68,299 | 2,690
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 68,299 | 2,690
Less Than 12 Months - Unrealized Losses | (149) | (2)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (149) | (2)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 153,214 | 31,416
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 153,214 | 31,416
Less Than 12 Months - Unrealized Losses | (2,087) | (256)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (2,087) | (256)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 358,140 | 44,968
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 358,140 | 44,968
Less Than 12 Months - Unrealized Losses | (5,966) | (1,728)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (5,966) | (1,728)
ABS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 32,548 | 14,929
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 32,548 | 14,929
Less Than 12 Months - Unrealized Losses | (101) | (18)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | (101) | (18)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 222,192 | 98,409
12 Months or Greater - Fair Value | 10,056 | 3,566
Total - Fair Value | 232,248 | 101,975
Less Than 12 Months - Unrealized Losses | (2,271) | (773)
12 Months or Greater - Unrealized Losses | (125) | (65)
Total - Unrealized Losses | (2,396) | (838)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 81,828 | 13,212
12 Months or Greater - Fair Value | 4,000 | 2,799
Total - Fair Value | 85,828 | 16,011
Less Than 12 Months - Unrealized Losses | (866) | (789)
12 Months or Greater - Unrealized Losses | (68) | (336)
Total - Unrealized Losses | (934) | (1,125)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 124,739 | 95,287
12 Months or Greater - Fair Value | 21,973 | 73,904
Total - Fair Value | 146,712 | 169,191
Less Than 12 Months - Unrealized Losses | (27) | (261)
12 Months or Greater - Unrealized Losses | (38) | (431)
Total - Unrealized Losses | (65) | $ (692)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 4,479 |
12 Months or Greater - Fair Value | 0 |
Total - Fair Value | 4,479 |
Less Than 12 Months - Unrealized Losses | (6) |
12 Months or Greater - Unrealized Losses | 0 |
Total - Unrealized Losses | $ (6) |

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