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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]          
Depreciation     $ 8,662 $ 8,666 $ 8,858
Asset Impairment Charges $ 333 $ 1,255 $ 333 $ 1,255