Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v3.7.0.1
Commitments and Contingencies (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2015
Jun. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]      
Contract receivable   $ 38,080 $ 20,169
Contracts in progress   31,643 $ 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