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Segment Reporting (Allocation of Goodwill and Intangible 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 goodwill and intangible assets	$ 120,435	$ 115,536
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	203	235
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	8,542	8,763
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	24,571	21,338
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	46,419	46,186
Venezuela [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	7,434	7,217
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	33,266	31,797
Total Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 120,232	$ 115,301