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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Beginning Balance $ (53,225)
Other comprehensive income (loss) 25,519
Ending Balance (27,706)
Foreign Currency Translation Adjustment [Member]  
Beginning Balance (50,450)
Other comprehensive income (loss) 25,624
Ending Balance (24,826)
Defined Benefit Pension Plan [Member]  
Beginning Balance (2,775)
Other comprehensive income (loss) (105)
Ending Balance $ (2,880)