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Investments - Schedule of Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,184,856 | $ 4,897,607
Unrealized Gains | 4,273 | 98,747
Unrealized Losses | (447,504) | (33,467)
Fair Value | 4,741,625 | 4,962,887
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 584,173 | 447,926
Unrealized Gains | 341 | 3,833
Unrealized Losses | (28,076) | (2,966)
Fair Value | 556,438 | 448,793
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,059 | 5,501
Unrealized Gains | 7 | 3
Unrealized Losses | (8) | 0
Fair Value | 49,058 | 5,504
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 898,675 | 1,005,611
Unrealized Gains | 258 | 13,365
Unrealized Losses | (115,190) | (10,113)
Fair Value | 783,743 | 1,008,863
Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 661,934 | 598,764
Unrealized Gains | 2,010 | 30,122
Unrealized Losses | (61,254) | (1,287)
Fair Value | 602,690 | 627,599
Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 69,651 | 77,366
Unrealized Gains | 0 | 3,232
Unrealized Losses | (7,252) | (855)
Fair Value | 62,399 | 79,743
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,546,513 | 1,428,645
Unrealized Gains | 1,195 | 36,067
Unrealized Losses | (133,387) | (9,465)
Fair Value | 1,414,321 | 1,455,247
Residential and commercial mortgage securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 577,915 | 541,638
Unrealized Gains | 390 | 10,452
Unrealized Losses | (66,481) | (6,667)
Fair Value | 511,824 | 545,423
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 660,345 | 582,144
Unrealized Gains | 72 | 1,673
Unrealized Losses | (35,856) | (2,114)
Fair Value | 624,561 | 581,703
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 136,591 | 210,012
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 136,591 | $ 210,012

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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