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Investments (Short Term Investments Gains and Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Investments, Debt and Equity Securities [Abstract] |  |
Initial Book Value | $ (29,052) | $ (69,290)
Cumulative Gross Unrealized Gains | 101,587 | 298,490
Cumulative Gross Unrealized Losses | 0 | 0
Fair Value | $ 72,535 | $ 229,200

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