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Segment Reporting (Allocation of Goodwill and Intangible Assets Based on Geography) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 107,369	$ 115,453
US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	58	119
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	5,091	6,059
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	31,879	36,462
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	38,280	38,600
Chile [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	26,026	28,985
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	6,035	5,228
Total Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 107,311	$ 115,334