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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |
Realized gross gains | $ 1,219 | $ 14,420 | $ 4,044
Realized gross losses | 8,246 | 14,864 | 3,626
Impairment loss | 177 | 12,728 | 0
Fair Value |  |  |
Less than 12 months | 550,525 | 2,474,361 |
12 months or more | 3,200,767 | 1,586,877 |
Total | 3,751,292 | 4,061,238 |
Gross Unrealized Losses |  |  |
Less than 12 months | (5,759) | (198,613) |
12 months or more | (330,678) | (248,891) |
Total | (336,437) | (447,504) |
Realized gross gains | 1,219 | 14,420 | 4,044
Realized gross losses | 8,246 | 14,864 | 3,626
Impairment loss | 177 | 12,728 | $ 0
U.S. Treasury securities |  |  |
Fair Value |  |  |
Less than 12 months | 139,398 | 321,848 |
12 months or more | 355,921 | 169,795 |
Total | 495,319 | 491,643 |
Gross Unrealized Losses |  |  |
Less than 12 months | (1,075) | (12,381) |
12 months or more | (18,053) | (15,695) |
Total | (19,128) | (28,076) |
U.S. agency securities |  |  |
Fair Value |  |  |
Less than 12 months | 5,572 | 7,117 |
12 months or more | 1,623 | 0 |
Total | 7,195 | 7,117 |
Gross Unrealized Losses |  |  |
Less than 12 months | (2) | (8) |
12 months or more | (2) | 0 |
Total | (4) | (8) |
U.S. agency mortgage-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 129,359 | 351,310 |
12 months or more | 654,018 | 415,743 |
Total | 783,377 | 767,053 |
Gross Unrealized Losses |  |  |
Less than 12 months | (1,616) | (34,193) |
12 months or more | (100,383) | (80,997) |
Total | (101,999) | (115,190) |
Municipal debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 59,301 | 335,784 |
12 months or more | 297,039 | 64,766 |
Total | 356,340 | 400,550 |
Gross Unrealized Losses |  |  |
Less than 12 months | (987) | (41,620) |
12 months or more | (43,462) | (19,634) |
Total | (44,449) | (61,254) |
Non-U.S. government securities |  |  |
Fair Value |  |  |
Less than 12 months | 0 | 48,071 |
12 months or more | 67,447 | 14,328 |
Total | 67,447 | 62,399 |
Gross Unrealized Losses |  |  |
Less than 12 months | 0 | (2,914) |
12 months or more | (10,069) | (4,338) |
Total | (10,069) | (7,252) |
Corporate debt securities |  |  |
Fair Value |  |  |
Less than 12 months | 119,764 | 811,217 |
12 months or more | 905,606 | 421,307 |
Total | 1,025,370 | 1,232,524 |
Gross Unrealized Losses |  |  |
Less than 12 months | (733) | (69,415) |
12 months or more | (87,170) | (63,972) |
Total | (87,903) | (133,387) |
Residential and commercial mortgage securities |  |  |
Fair Value |  |  |
Less than 12 months | 31,936 | 265,934 |
12 months or more | 459,789 | 242,366 |
Total | 491,725 | 508,300 |
Gross Unrealized Losses |  |  |
Less than 12 months | (999) | (22,628) |
12 months or more | (52,510) | (43,853) |
Total | (53,509) | (66,481) |
Asset-backed securities |  |  |
Fair Value |  |  |
Less than 12 months | 65,195 | 333,080 |
12 months or more | 459,324 | 258,572 |
Total | 524,519 | 591,652 |
Gross Unrealized Losses |  |  |
Less than 12 months | (347) | (15,454) |
12 months or more | (19,029) | (20,402) |
Total | $ (19,376) | $ (35,856) |

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