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Long-Term Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Long Term Debt [Line Items]          
Borrowings under Guaranteed Investment Agreements $ 116,800   $ 116,800    
Line of Credit Facility, Interest Rate Description     The floating interest rates on the revolving notes are between DTF+6% and DTF+7%. DTF is the primary measure of interest rates in Colombia.    
Long-term Line of Credit 30,800   $ 30,800   $ 26,800
Interest Expense, Debt 2,307 $ 2,380 6,509 $ 6,647  
Assets Acquired Under Capital Lease 44,600 $ 3,100 44,624 $ 3,152  
Revolving Lines Of Credit [Member]          
Long Term Debt [Line Items]          
Long-term Line of Credit 6,700   6,700   400
Line of Credit Facility, Maximum Borrowing Capacity 7,100   7,100    
Revolving Lines Of Credit [Member] | Other Noncurrent Assets [Member]          
Long Term Debt [Line Items]          
Long-term Line of Credit 48,056   48,056   26,856
Secured Debt [Member] | Other Noncurrent Assets [Member]          
Long Term Debt [Line Items]          
Long-term Line of Credit 300   300   400
Debt Instrument, Collateral Amount 402   402   435
Secured Debt [Member] | Property, Plant and Equipment [Member]          
Long Term Debt [Line Items]          
Long-term Line of Credit 5,900   5,900   7,400
Debt Instrument, Collateral Amount $ 7,186   $ 7,186   $ 7,362
Maximum [Member]          
Long Term Debt [Line Items]          
Debt Instrument, Term     15 years    
Debt Instrument, Interest Rate, Effective Percentage 14.70%   14.70%    
Minimum [Member]          
Long Term Debt [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage 2.80%   2.80%