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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Available-for-sale Securities |  |  |
Gross Realized Gains | $ 70,785 | $ 1,772 | $ 3,201
Fair Value at Sale | 811,260 | 213,979 | 47,849
Gross Realized Losses | (4,094) | (544) | (1,546)
Fair Value at Sale | 31,615 | 45,995 | 136,939
Net realized gains (losses) | 66,691 | 1,228 | 1,655
Net Fair Value at Sale | 842,875 | 259,974 | 184,788
Fixed Maturities |  |  |
Schedule of Available-for-sale Securities |  |  |
Gross Realized Gains | 32,460 | 1,678 | 373
Fair Value at Sale | 678,736 | 209,302 | 41,776
Gross Realized Losses | (478) | (324) | (1,376)
Fair Value at Sale | 16,552 | 43,573 | 135,944
Equity Securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Gross Realized Gains | 38,325 | 94 | 2,828
Fair Value at Sale | 131,178 | 814 | 6,073
Gross Realized Losses | (3,602) | (219) | (170)
Fair Value at Sale | 13,805 | 1,387 | 995
Short-term Investments |  |  |
Schedule of Available-for-sale Securities |  |  |
Gross Realized Gains | 0 | 0 | 0
Fair Value at Sale | 1,346 | 3,863 | 0
Gross Realized Losses | (14) | (1) | 0
Fair Value at Sale | $ 1,258 | $ 1,035 | $ 0

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