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Investments - Securities In Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 4,342,497 | $ 1,970,111
12 Months or Greater - Fair Value | 393,966 | 85,830
Total - Fair Value | 4,736,463 | 2,055,941
Less Than 12 Months - Unrealized Losses | (340,662) | (26,842)
12 Months or Greater - Unrealized Losses | (46,964) | (1,625)
Total - Unrealized Losses | $ (387,626) | $ (28,467)
Number of securities in unrealized loss position (in securities) | security | 1,164 | 610
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | $ 106,464 | $ 91,154
12 Months or Greater - Fair Value | 2,561 | 2,616
Total - Fair Value | 109,025 | 93,770
Less Than 12 Months - Unrealized Losses | (6,062) | (790)
12 Months or Greater - Unrealized Losses | (233) | (78)
Total - Unrealized Losses | (6,295) | (868)
Obligations of U.S. states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 1,471,282 | 452,021
12 Months or Greater - Fair Value | 34,851 | 15,540
Total - Fair Value | 1,506,133 | 467,561
Less Than 12 Months - Unrealized Losses | (168,115) | (7,189)
12 Months or Greater - Unrealized Losses | (5,978) | (207)
Total - Unrealized Losses | (174,093) | (7,396)
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 2,043,621 | 865,085
12 Months or Greater - Fair Value | 172,444 | 10,997
Total - Fair Value | 2,216,065 | 876,082
Less Than 12 Months - Unrealized Losses | (130,168) | (13,260)
12 Months or Greater - Unrealized Losses | (27,987) | (516)
Total - Unrealized Losses | (158,155) | (13,776)
ABS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 79,046 | 100,064
12 Months or Greater - Fair Value | 17,173 | 1,552
Total - Fair Value | 96,219 | 101,616
Less Than 12 Months - Unrealized Losses | (4,066) | (998)
12 Months or Greater - Unrealized Losses | (739) | (10)
Total - Unrealized Losses | (4,805) | (1,008)
RMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 140,146 | 180,586
12 Months or Greater - Fair Value | 81,398 | 31,641
Total - Fair Value | 221,544 | 212,227
Less Than 12 Months - Unrealized Losses | (10,365) | (2,548)
12 Months or Greater - Unrealized Losses | (7,226) | (730)
Total - Unrealized Losses | (17,591) | (3,278)
CMBS |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 228,340 | 89,889
12 Months or Greater - Fair Value | 33,890 | 1,511
Total - Fair Value | 262,230 | 91,400
Less Than 12 Months - Unrealized Losses | (12,783) | (1,887)
12 Months or Greater - Unrealized Losses | (2,746) | (49)
Total - Unrealized Losses | (15,529) | (1,936)
CLOs |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 269,852 | 177,663
12 Months or Greater - Fair Value | 51,649 | 21,973
Total - Fair Value | 321,501 | 199,636
Less Than 12 Months - Unrealized Losses | (8,363) | (71)
12 Months or Greater - Unrealized Losses | (2,055) | (35)
Total - Unrealized Losses | (10,418) | (106)
Foreign government debt |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months - Fair Value | 3,746 | 13,649
12 Months or Greater - Fair Value | 0 | 0
Total - Fair Value | 3,746 | 13,649
Less Than 12 Months - Unrealized Losses | (740) | (99)
12 Months or Greater - Unrealized Losses | 0 | 0
Total - Unrealized Losses | $ (740) | $ (99)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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