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Investments - Schedule of Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 2,115,232 | $ 839,581
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (202,843) | (10,309)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 124,695 | 70,909
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (25,655) | (3,561)
Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,114,395 | 764,334
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (202,843) | (10,305)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 124,695 | 70,909
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (25,655) | (3,561)
Short-Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 837 | 75,247
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses |  | (4)
U.S. Government and Agencies [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 28,438 | 24,928
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (614) | (45)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,472 | 1,557
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (104) | (34)
U.S. Government and Agencies [Member] | Short-Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 837 | 34,967
Foreign Government [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 122,160 | 18,894
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (7,938) | (384)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 6,517 | 3,335
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (2,317) | (211)
Foreign Government [Member] | Short-Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 4,995
States and Political Subdivisions [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 113,680 | 15,909
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (14,386) | (254)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 969 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (71) |
States and Political Subdivisions [Member] | Short-Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 11,394
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses |  | (1)
Corporates [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,192,279 | 341,963
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (117,546) | (5,035)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 81,221 | 59,414
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (19,323) | (3,033)
Corporates [Member] | Short-Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 23,891
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses |  | (3)
Residential Mortgage-backed Securities [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 393,787 | 234,911
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (42,970) | (3,131)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 22,195 | 2,707
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (2,703) | (99)
Commercial Mortgage-backed Securities [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 126,131 | 47,220
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (9,235) | (419)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 8,004 | 117
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (626) | (1)
Other Asset-backed Securities [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 137,920 | 80,509
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (10,154) | (1,037)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 4,317 | 3,779
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (511) | $ (183)

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