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Equipment Acquisitions and Dispositions - Schedule of Gain on Sale of Windcat Workboats (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 12, 2021
Mar. 31, 2021
Mar. 31, 2020
Property Plant And Equipment [Line Items]      
Total Net Proceeds   $ 3,266 $ 3,105
Windcat Workboats      
Property Plant And Equipment [Line Items]      
Total Proceeds Received $ 43,797    
Transactions Fees and other Costs 1,562    
Cash Sold 3,520    
Total Net Proceeds 38,715    
Less: Net Equity in Windcat Workboats, net of cash sold 15,790    
Less: January Income on Discontinued Operations 169    
Gain on Sale of Windcat Workboats $ 22,756