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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, 2015 | Dec. 31, 2014
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Fair Value Disclosures [Abstract] |  |
Other investments | $ 504,693 | $ 504,147
Other assets | 88,086 | 5,664
Other liabilities | $ 12,385 | $ 14,408

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