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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, 2017 | Dec. 31, 2016
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 594,793 | $ 549,805
Other assets | 2,542 | 4,379
Other liabilities | $ 5,494 | $ 17,383

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