Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Aeroleo (Details)

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LONG-TERM DEBT - Aeroleo (Details)
 1 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 01, 2015
USD ($)
note_payable
Debt Instrument [Line Items]        
Contribution of capital from joint venture partner     $ 6,349,000  
Aeroleo        
Debt Instrument [Line Items]        
Contribution of capital from joint venture partner $ 6,300,000      
Aeroleo | Notes Payable, 6% Per Annum | Loans Payable        
Debt Instrument [Line Items]        
Assigned number of notes receivable | note_payable       2
Face amount       $ 8,300,000.0
Tax Disputes | Brazil        
Debt Instrument [Line Items]        
Amount due to taxing authority   $ 3,000,000