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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 2,182,479 | $ 1,993,059
Other assets | 4,416 | 6,100
Other liabilities | $ 8,515 | $ 10,827

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