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Segment Reporting (Allocation of Goodwill and Intangible Assets Based on Geography) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 107,183	$ 107,464
US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	21	46
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	8,417	9,050
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	32,147	32,955
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	36,222	35,993
Chile [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	25,371	24,638
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	5,005	4,782
Total Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 107,162	$ 107,418