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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, 2016 | Dec. 31, 2015
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 549,805 | $ 481,621
Other assets | 4,379 | 3,463
Other liabilities | $ 17,383 | $ 9,362

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