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Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]          
Balance at beginning of period     $ 45,107 $ 62,146  
Impairment loss     (45,107) (16,399) $ 0
Other adjustments       (640)  
Balance at end of period $ 0 $ 45,107 0 45,107 62,146
Well Intervention [Member]          
Goodwill [Roll Forward]          
Balance at beginning of period     0 17,039  
Impairment loss   (16,400) 0 (16,399)  
Other adjustments       (640)  
Balance at end of period 0 0 0 0 17,039
Robotics [Member]          
Goodwill [Roll Forward]          
Balance at beginning of period     45,107 45,107  
Impairment loss (45,100)   (45,107) 0  
Other adjustments       0  
Balance at end of period $ 0 $ 45,107 $ 0 $ 45,107 $ 45,107