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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 1,738,737 | $ 1,256,948
Other assets | 7,445 | 8,982
Other liabilities | $ 12,966 | $ 15,193

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