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, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2011
Variable Interest Entity [Line Items]        
Operating revenues $ 54,527 $ 62,582    
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]        
Assets 13,700   $ 12,900  
Liabilities 9,200   $ 9,200  
Operating revenues 10,200 7,600    
Net gain (loss) from consolidation $ 900 $ (700)