Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL INFORMATION FOR STATEMENTS OF CASH FLOWS Schedule of Supplemental Cash Flow Disclosures (Details)

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SUPPLEMENTAL INFORMATION FOR STATEMENTS OF CASH FLOWS Schedule of Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]      
Income taxes paid, net of refunds $ 283 $ 426 $ (5,978)
Interest paid to others, excluding capitalized interest 13,581 15,315 15,268
Schedule of non-cash investing and financing activities:      
Contribution of notes payable as additional capital into Aeróleo 0 0 6,349
Settlement of accrued contingent liabilities through installment obligations $ 0 $ 386 $ 2,486