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
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2011
Variable Interest Entity [Line Items]      
Economic interest percent 50.00%   50.00%
Voting interest percent 20.00%   20.00%
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets $ 14.2 $ 11.9  
Liabilities $ 5.9 $ 4.5