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Segment Reporting (Allocation of Long-Lived Tangible Assets Based on Geography) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 72,028 $ 78,319
Total long-lived tangible assets 82,735 91,545
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 10,707 13,226
Argentina [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 29,394 28,005
Brazil [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 14,805 8,237
Mexico [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets 2,709 2,801
Venezuela [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets [1] 21,264 36,237
Other Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Other countries long-lived tangible assets $ 3,856 $ 3,039
[1] After the impairment of Venezuelan long-lived assets. See Note 2 "Foreign currency translation - Venezuelan currency status".