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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Foreign currency translation adjustment $ 1,999 $ (18,613) $ 1,247 $ (11,196)
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 543,857 609,242 575,987 615,948
Ending Balance 528,446 587,833 528,446 587,833
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 24 164 116 147
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests     13,342  
Foreign currency translation adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (36,669)  
Other comprehensive income (loss)     1,293  
Ending Balance (35,376)   (35,376)  
Defined benefit pension plan        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (2,647)  
Other comprehensive income (loss)     116  
Ending Balance (2,531)   (2,531)  
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   594  
Accumulated Other Comprehensive Income (Loss)        
Foreign currency translation adjustment 2,025 (18,905) 1,293 (11,489)
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (39,362) (14,137) (38,978) (21,536)
Other comprehensive income (loss)     1,665  
Ending Balance (37,313) (32,878) (37,313) (32,878)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax $ 24 $ 164 116 $ 147
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests     $ (256)