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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance $ 575,987
Ending Balance 543,858
Foreign currency translation adjustment  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (36,669)
Other comprehensive income (loss) (732)
Ending Balance (37,401)
Defined benefit pension plan  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (2,647)
Other comprehensive income (loss) 92
Ending Balance (2,555)
Liquidation of non-US entity and purchase of non-controlling interests  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance 338
Other comprehensive income (loss) 256
Ending Balance 594
Accumulated Other Comprehensive Income (Loss)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Beginning Balance (38,978)
Other comprehensive income (loss) (384)
Ending Balance $ (39,362)