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Debt (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Banco Bisa Line of Credit [Member]    
Debt and capital lease obligations (Textual) [Abstract]    
Line of Credit Facility, Remaining Borrowing Capacity $ 12,000  
Line of Credit Facility, Interest Rate at Period End 6.00%  
Senior Notes due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net $ 1,900 $ 2,000
San Bartolome Letter of Credit Facility [Member]    
Debt and capital lease obligations (Textual) [Abstract]    
Line of Credit Facility, Fair Value of Amount Outstanding $ 0