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Fair Value Measurements - Additional Information (Details) - USD ($) | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |  |
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis | $ 53,900,000 |  |
Available-for-sale Securities, Equity investment securities | 206,000 |  | $ 206,000
Change in market value common stock investment Ioss | 28,000 |  |
Common Stocks by Industry [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Available-for-sale Securities, Equity investment securities |  | $ 677,000,000 |
Level 2 [Member] | Equity Investment [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Available-for-sale Securities, Equity investment securities | 677,000,000 |  |
Corporate [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Available for sale securities aggregate market value | 616,000 |  | $ 722,000
Corporate [Member] | Level 2 [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Available for sale securities continuous unrealized loss position twelve months or more amortized historical cost basis | 4,100,000 |  |
Available for sale securities aggregate market value | $ 4,800,000 |  |

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