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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, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Other investments $ 481,621 $ 504,147
Other assets 3,463 5,664
Other liabilities $ 9,362 $ 14,408