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International Retirement Plan (Summary Of Amounts Recognized In Consolidated Balance Sheets) (Details) - International Retirement Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Accrued liabilities $ 114 $ 117  
Other liabilities 7,613 6,211  
Projected benefit obligation 7,727 6,328 $ 7,194
Accumulated other comprehensive income (2,775) (1,873)  
Total $ 4,952 $ 4,455