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GULFMARK MERGER - Additional Information (Details)
$ in Millions
Jul. 15, 2018
USD ($)
shares
Business Acquisition [Line Items]  
Ownership percentage 74.00%
Fee payable on termination | $ $ 35.0
GulfMark  
Business Acquisition [Line Items]  
Shares received upon conversion | shares 1.1
Shares received upon warrant conversion | shares 1.1
Ownership percentage 26.00%
Fee payable on termination | $ $ 13.0