Quarterly report pursuant to Section 13 or 15(d)

Note 15 - Segment Information - Income (Loss) in Equity Method Investments (Details)

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Note 15 - Segment Information - Income (Loss) in Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity in earnings (losses) of 50% or less owned companies $ (1,027) $ (7,306) $ (1,540) $ (5,297)
MexMar [Member]        
Equity in earnings (losses) of 50% or less owned companies 137 793 2,644 3,382
Other Offshore Marine Services Joint Ventures [Member]        
Equity in earnings (losses) of 50% or less owned companies $ (1,164) $ (8,099) $ (4,184) $ (8,679)