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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Beginning Balance $ (53,225)
Other comprehensive income (loss) 20,665
Ending Balance (32,560)
Foreign Currency Translation Adjustment [Member]  
Beginning Balance (50,450)
Other comprehensive income (loss) 20,746
Ending Balance (29,704)
Defined Benefit Pension Plan [Member]  
Beginning Balance (2,775)
Other comprehensive income (loss) (81)
Ending Balance $ (2,856)