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Segment and Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting [Line Items]        
Sales Revenue, Goods, Net, Total $ 58,053 $ 51,936 $ 110,096 $ 99,777
Colombia        
Segment Reporting [Line Items]        
Sales Revenue, Goods, Net, Total 21,869 21,797 39,251 42,752
United States        
Segment Reporting [Line Items]        
Sales Revenue, Goods, Net, Total 33,344 26,041 65,022 47,908
Panama        
Segment Reporting [Line Items]        
Sales Revenue, Goods, Net, Total 1,355 3,418 2,823 7,833
Other        
Segment Reporting [Line Items]        
Sales Revenue, Goods, Net, Total $ 1,485 $ 680 $ 3,000 $ 1,284