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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2015
Mar. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]      
Contract receivable   $ 21,061 $ 20,169
Contracts in progress   30,380 $ 26,829
Contract Receivable | Customer of Shipyard      
Loss Contingencies [Line Items]      
Contract receivable   4,600  
Contracts in progress   $ 4,900  
Large Deepwater Project, Recently Delivered      
Loss Contingencies [Line Items]      
Contract losses $ 24,500