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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 784,933 | $ 594,793
Other assets and (liabilities) | 4,968 | 2,542
Other liabilities | $ 13,327 | $ 5,494

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