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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, 2020 | Dec. 31, 2019
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 1,122,683 | $ 1,087,377
Other assets | 11,508 | 32,944
Other liabilities | $ 18,116 | $ 28,213

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