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International Retirement Plan (Components Of Net Periodic Benefit Costs And Other Amounts Recognized In Other Comprehensive Income) (Details) - International Retirement Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 178 $ 150
Interest cost 156 200
Amortization of actuarial loss 154 69
Total 488 419
Net (gain) loss (338) 1,135
Total expense recognized in net periodic benefit cost and other comprehensive income (loss) $ 150 $ 1,554