Segment Reporting Summary Of Information Of Long-Lived Assets In Different Geographic Areas (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	$ 637,533	$ 654,040
United States And Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	291,493	431,601
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	158,950	89,731
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	8,787	9,492
FRANCE
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	77,412	49,602
SPAIN
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	93,049	70,648
SOUTH AFRICA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	4,167	2,064
ITALY
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	3,249	508
SWITZERLAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	266	287
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	[1]	$ 160	$ 107

[1] Long-lived assets represent fixed assets, net of accumulated depreciation.