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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Beginning Balance     $ (39,548)  
Other comprehensive income (loss) $ (6,544) $ 14,589 1,275 $ (5,978)
Ending Balance (38,273)   (38,273)  
Foreign Currency Translation Adjustment [Member]        
Beginning Balance     (37,675)  
Other comprehensive income (loss)     1,239  
Ending Balance (36,436)   (36,436)  
Defined Benefit Pension Plan [Member]        
Beginning Balance     (1,873)  
Other comprehensive income (loss)     36  
Ending Balance $ (1,837)   $ (1,837)