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Investments - Schedule of Amortized Cost and Fair Value of Investments Available for Sale by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 4,836,528 | $ 4,897,607
Fair Value |  |
Fair Value | 4,662,905 | 4,962,887
U.S. Treasury securities |  |
Amortized Cost |  |
Due in 1 year | 88,143 |
Due after 1 but within 5 years | 302,905 |
Due after 5 but within 10 years | 42,566 |
Due after 10 years | 3,836 |
Subtotal | 437,450 |
Amortized Cost | 437,450 | 447,926
Fair Value |  |
Due in 1 year | 87,953 |
Due after 1 but within 5 years | 291,389 |
Due after 5 but within 10 years | 40,826 |
Due after 10 years | 3,472 |
Subtotal | 423,640 |
Municipal debt securities |  |
Amortized Cost |  |
Due in 1 year | 1,659 |
Due after 1 but within 5 years | 119,337 |
Due after 5 but within 10 years | 164,952 |
Due after 10 years | 244,891 |
Subtotal | 530,839 |
Amortized Cost | 530,839 | 598,764
Fair Value |  |
Due in 1 year | 1,665 |
Due after 1 but within 5 years | 119,368 |
Due after 5 but within 10 years | 162,102 |
Due after 10 years | 229,050 |
Subtotal | 512,185 |
Non-U.S. government securities: |  |
Amortized Cost |  |
Due in 1 year | 427 |
Due after 1 but within 5 years | 38,669 |
Due after 5 but within 10 years | 8,878 |
Due after 10 years | 25,123 |
Subtotal | 73,097 |
Amortized Cost | 73,097 | 77,366
Fair Value |  |
Due in 1 year | 430 |
Due after 1 but within 5 years | 39,429 |
Due after 5 but within 10 years | 9,073 |
Due after 10 years | 22,811 |
Subtotal | 71,743 |
Corporate debt securities |  |
Amortized Cost |  |
Due in 1 year | 214,080 |
Due after 1 but within 5 years | 563,001 |
Due after 5 but within 10 years | 424,445 |
Due after 10 years | 137,646 |
Subtotal | 1,339,172 |
Amortized Cost | 1,339,172 | 1,428,645
Fair Value |  |
Due in 1 year | 214,038 |
Due after 1 but within 5 years | 551,936 |
Due after 5 but within 10 years | 394,068 |
Due after 10 years | 123,602 |
Subtotal | 1,283,644 |
U.S. agency mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 902,741 |
Amortized Cost | 902,741 | 1,005,611
Fair Value |  |
Without single maturity date | 854,775 |
Residential and commercial mortgage securities |  |
Amortized Cost |  |
Without single maturity date | 565,116 |
Amortized Cost | 565,116 | 541,638
Fair Value |  |
Without single maturity date | 538,870 |
Asset-backed securities |  |
Amortized Cost |  |
Without single maturity date | 604,516 |
Amortized Cost | 604,516 | 582,144
Fair Value |  |
Without single maturity date | 594,451 |
Money market funds |  |
Amortized Cost |  |
Without single maturity date | 383,597 |
Amortized Cost | 383,597 | $ 210,012
Fair Value |  |
Without single maturity date | $ 383,597 |

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