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Segment Reporting Summary Of Information Of Long-Lived Assets In Different Geographic Areas (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment $ 833,907 [1] $ 776,884 [1]
United States And Canada [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 523,818 [1] 470,196 [1]
MEXICO
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 79,279 [1] 75,145 [1]
BRAZIL
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 47,593 [1] 54,466 [1]
FRANCE
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 55,792 [1] 52,337 [1]
SPAIN
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 78,392 [1] 76,510 [1]
SOUTH AFRICA
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 36,937 [1] 35,559 [1]
SWITZERLAND
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment 4,829 [1] 5,032 [1]
Other Countries [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net property, plant and equipment $ 7,267 [1] $ 7,639 [1]
[1] Long-lived assets represent fixed assets, net of accumulated depreciation.