Quarterly report pursuant to Section 13 or 15(d)

Revenue and Contract Costs - Narrative (Details)

v3.5.0.2
Revenue and Contract Costs - Narrative (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
Customer
Project
Dec. 31, 2015
USD ($)
Long-term Contracts or Programs Disclosure [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 11,272 $ 12,822
Number of major customers | Customer 1  
Billings in excess of costs and estimated earnings $ 7,328 7,081
Customer advances $ 5,000  
Number of major customers, advances | Customer 3  
Revisions to revenue related to disputed change orders $ 488  
Project, Approved Scope, Unapproved Price    
Long-term Contracts or Programs Disclosure [Line Items]    
Revenue $ 2,400  
Number of projects | Project 4  
Large Deepwater Project, Recently Delivered    
Long-term Contracts or Programs Disclosure [Line Items]    
Contract losses   $ 24,500
One Major Customer | Customer Concentration Risk | Costs in Excess of Billings    
Long-term Contracts or Programs Disclosure [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 1,900