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Segment Reporting (Allocation of Long-Lived Tangible Assets Based on Geography) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets $ 89,932 $ 81,633
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets 11,862 12,756
Argentina [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets 22,945 22,379
Brazil [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets 23,445 17,150
Mexico [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets 2,707 2,475
Venezuela [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets 21,483 21,556
Other Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets 7,490 5,317
Total Foreign Countries [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived tangible assets $ 78,070 $ 68,877