Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES - Narrative (Details)

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VARIABLE INTEREST ENTITIES - Narrative (Details) - Aeroleo - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2011
Variable Interest Entity [Line Items]      
Economic interest percent     50.00%
Voting interest percent     20.00%
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets $ 11.6 $ 11.5  
Liabilities $ 5.3 $ 7.6