Property, Plant and Equipment Summary of Impairment charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	$ 14,763	$ 1,273	$ 13,630
North America [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	1,895	0	0
Europe [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	6,327	0	2,285
Asia Pacific [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	6,541	1,273	0
South America [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	$ 0	$ 0	$ 11,345