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Restructuring And Optimization Programs (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring And Optimization Programs [Abstract]        
Restructuring and impairment charges $ 3,768 $ 3,224 $ 7,874 $ 6,242
Equity method impairment charge       $ 1,500
Period expected for cash payments for employee benefits and other costs     over the next twelve months