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
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Oct. 01, 2015
Dec. 31, 2011
Variable Interest Entity [Line Items]          
Operating revenues $ 62,582 $ 67,415      
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 15,100   $ 17,900    
Liabilities 13,600   $ 15,900    
Operating revenues 7,600        
Net gain (loss) from consolidation $ (700)        
Pro Forma          
Variable Interest Entity [Line Items]          
Operating revenues   78,740      
Pro Forma | Aeroleo | Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Operating revenues   $ 11,325