Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Summary of Income Tax Contingencies (Details)

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INCOME TAXES Summary of Income Tax Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 261 $ 648 $ 0
Reductions due to settlements with taxing authorities (250) (570) 0
Increases due to tax positions taken during the current year 0 183 0
Increases due to the consolidation of Aeróleo 0 0 648
Ending balance $ 11 $ 261 $ 648