Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details)

v3.8.0.1
Organization and Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended
Apr. 20, 2018
USD ($)
Jan. 03, 2018
USD ($)
Mar. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of operating segments | segment     4  
Operating loss carryforwards       $ 62,800
Valuation allowance     $ 1,400 392
Expire In 2035        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating loss carryforwards       $ 4,000
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Proceeds from sale of PP&E   $ 750    
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Sale of PP&E $ 55,000      
Cost of PP&E sales 1,500      
Proceeds from sale of PP&E $ 52,700