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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Available-for-sale Securities |  |  |
Fair Value at Sale | $ 267,198 | $ 811,260 | $ 213,979
Fair Value at Sale | 257,359 | 31,615 | 45,995
Net Fair Value at Sale | 524,557 | 842,875 | 259,974
Debt Securities, Available-for-sale, Realized Gain (Loss) | 7,681 | 70,785 | 1,772
Debt Securities, Available-for-sale, Realized Loss | 4,114 | 4,094 | 544
Debt Securities, Available-for-sale, Realized Gain (Loss) | 3,567 | 66,691 | 1,228
Fixed Maturities |  |  |
Schedule of Available-for-sale Securities |  |  |
Fair Value at Sale | 221,597 | 678,736 | 209,302
Fair Value at Sale | 220,809 | 16,552 | 43,573
Debt Securities, Available-for-sale, Realized Gain (Loss) | 2,112 | 32,460 | 1,678
Debt Securities, Available-for-sale, Realized Loss | 4,050 | 478 | 324
Equity Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Fair Value at Sale | 12,116 | 131,178 | 814
Fair Value at Sale | 575 | 13,805 | 1,387
Equity Securities, FV-NI, Realized Gain | 5,569 | 38,325 | 94
Equity Securities, FV-NI, Realized Loss | 18 | 3,602 | 219
Short-term Investments |  |  |
Schedule of Available-for-sale Securities |  |  |
Fair Value at Sale | 33,485 | 1,346 | 3,863
Fair Value at Sale | 35,975 | 1,258 | 1,035
Debt Securities, Available-for-sale, Realized Gain (Loss) | 0 | 0 | 0
Debt Securities, Available-for-sale, Realized Loss | $ 46 | $ 14 | $ 1

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- Definition Amount of realized gain 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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