Quarterly report pursuant to Section 13 or 15(d)

Noncontrolling Interests in Subsidiaries (Details)

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Noncontrolling Interests in Subsidiaries (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Noncontrolling Interests in Subsidiaries [Line Items]    
Net Income $ 1,469 $ 13,068
Net income attributable to noncontrolling interest $ 2 5,335
SEA-Vista | Ocean Services    
Noncontrolling Interests in Subsidiaries [Line Items]    
Net Income   10,900
Net income attributable to noncontrolling interest   $ 5,300