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Long-Term Debt (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Long Term Debt [Line Items]          
Borrowings under Guaranteed Investment Agreements $ 114,000   $ 114,000    
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 7,823   $ 7,823   $ 375
Interest Expense, Debt 2,050 $ 2,294 4,202 $ 4,267  
Line of Credit Facility, Maximum Borrowing Capacity $ 8,500   8,500    
Assets Acquired Under Capital Lease     $ 20,180 $ 2,462  
Maximum [Member]          
Long Term Debt [Line Items]          
Debt Instrument, Term     15 years    
Debt Instrument, Interest Rate, Effective Percentage 12.03%   12.03%    
Minimum [Member]          
Long Term Debt [Line Items]          
Debt Instrument, Term     6 months    
Debt Instrument, Interest Rate, Effective Percentage 2.90%   2.90%