Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Note 15 - Segment Information - Income (Loss) in Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity in earnings (losses) of 50% or less owned companies $ (721) $ 1,571 $ (513) $ 2,009
MexMar [Member]        
Equity in earnings (losses) of 50% or less owned companies 1,076 1,222 2,508 2,589
Other Offshore Marine Services Joint Ventures [Member]        
Equity in earnings (losses) of 50% or less owned companies $ (1,797) $ 349 $ (3,021) $ (580)