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Restructuring Charges Restructuring Charges (textuals) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Charges [Abstract]        
Restructuring Charges $ 4,023 $ 2,205 $ 5,455 $ 3,085