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Investments - Schedule of Realized Gain and Loss and Investments in Unrealized Loss Position (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |
Realized gross gains | $ 14,420 | $ 4,044 | $ 5,608
Realized gross losses | 14,864 | 3,626 | 2,482
Impairment loss | 12,728 | 0 | $ 429
Fair Value |  |  |
Less than 12 months | 2,474,361 | 2,033,809 |
12 months or more | 1,586,877 | 152,687 |
Total | 4,061,238 | 2,186,496 |
Gross Unrealized Losses |  |  |
Less than 12 months | (198,613) | (28,074) |
12 months or more | (248,891) | (5,393) |
Total | (447,504) | (33,467) |
U.S. Treasury securities |  |  |
Fair Value |  |  |
Less than 12 months | 321,848 | 207,122 |
12 months or more | 169,795 | 28,012 |
Total | 491,643 | 235,134 |
Gross Unrealized Losses |  |  |
Less than 12 months | (12,381) | (2,170) |
12 months or more | (15,695) | (796) |
Total | (28,076) | (2,966) |
U.S. agency securities |  |  |
Fair Value |  |  |
Less than 12 months | 7,117 |  |
12 months or more | 0 |  |
Total | 7,117 |  |
Gross Unrealized Losses |  |  |
Less than 12 months | (8) |  |
12 months or more | 0 |  |
Total | (8) |  |
U.S. agency mortgage-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 351,310 | 582,108 |
12 months or more | 415,743 | 26,131 |
Total | 767,053 | 608,239 |
Gross Unrealized Losses |  |  |
Less than 12 months | (34,193) | (9,414) |
12 months or more | (80,997) | (699) |
Total | (115,190) | (10,113) |
Municipal debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 335,784 | 91,719 |
12 months or more | 64,766 | 312 |
Total | 400,550 | 92,031 |
Gross Unrealized Losses |  |  |
Less than 12 months | (41,620) | (1,281) |
12 months or more | (19,634) | (6) |
Total | (61,254) | (1,287) |
Non-U.S. government securities |  |  |
Fair Value |  |  |
Less than 12 months | 48,071 | 22,986 |
12 months or more | 14,328 | 0 |
Total | 62,399 | 22,986 |
Gross Unrealized Losses |  |  |
Less than 12 months | (2,914) | (855) |
12 months or more | (4,338) | 0 |
Total | (7,252) | (855) |
Corporate debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 811,217 | 522,120 |
12 months or more | 421,307 | 46,875 |
Total | 1,232,524 | 568,995 |
Gross Unrealized Losses |  |  |
Less than 12 months | (69,415) | (7,200) |
12 months or more | (63,972) | (2,265) |
Total | (133,387) | (9,465) |
Residential and commercial mortgage securities |  |  |
Fair Value |  |  |
Less than 12 months | 265,934 | 268,617 |
12 months or more | 242,366 | 38,256 |
Total | 508,300 | 306,873 |
Gross Unrealized Losses |  |  |
Less than 12 months | (22,628) | (5,200) |
12 months or more | (43,853) | (1,467) |
Total | (66,481) | (6,667) |
Asset-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 333,080 | 339,137 |
12 months or more | 258,572 | 13,101 |
Total | 591,652 | 352,238 |
Gross Unrealized Losses |  |  |
Less than 12 months | (15,454) | (1,954) |
12 months or more | (20,402) | (160) |
Total | $ (35,856) | $ (2,114) |

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