Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Reconciliation of Valuation Allowance (Details)

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INCOME TAXES Reconciliation of Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 21,575 $ 12,650 $ 806
Increases to state valuation allowance 10,010 6,768 434
Increases due to consolidation of Aeróleo 0 0 11,285
Increases due to foreign valuation allowances 7,578 2,157 125
Decrease due to Brazilian PERT Program (4,196) 0 0
Balance at end of period $ 34,967 $ 21,575 $ 12,650