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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 955,437 | $ 784,933
Other assets | 42,372 | 4,968
Other liabilities | $ 34,430 | $ 13,327

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