Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES Narrative (Details)

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VARIABLE INTEREST ENTITIES Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Oct. 01, 2015
Dec. 31, 2011
Variable Interest Entity [Line Items]              
Operating revenues $ 65,006 $ 69,741 $ 190,939 $ 207,894      
Aeroleo              
Variable Interest Entity [Line Items]              
Economic interest percent             50.00%
Voting interest percent             20.00%
Aeroleo | Variable Interest Entity, Primary Beneficiary              
Variable Interest Entity [Line Items]              
Economic interest transferred, percent           50.00%  
Variable interest transferred, percent           80.00%  
Assets 14,100   14,100   $ 17,900    
Liabilities 9,700   9,700   $ 15,900    
Operating revenues 7,500   21,600        
Net gain (loss) from consolidation $ 2,400   $ 4,500