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Restructuring Charges Restructuring Charges (textuals) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Charges [Abstract]        
Restructuring Charges $ 3,385 $ 1,494 $ 8,840 $ 4,579