Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment and Leased Facilities and Equipment - Additional Information (Details)

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Property, Plant and Equipment and Leased Facilities and Equipment - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
ft²
a
Renewal_options
Dec. 31, 2019
USD ($)
ft²
a
Renewal_options
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Property, Plant and Equipment [Line Items]          
Depreciation and lease asset amortization   $ 9,564 $ 10,350 $ 12,745  
Operating lease, right-of-use asset $ 1,900 1,900      
Present value of lease liabilities 2,595 2,595      
Decrease in operating lease assets 2,500        
Decrease in operating lease liabilities 2,500        
Current lease liability 500 500      
Long-term lease liability $ 2,100 2,100      
Lease agreement expenses   1,800 $ 1,900 $ 2,000  
Operating lease payments   $ 2,000      
Operating lease, term of contract 4 years 7 months 6 days 4 years 7 months 6 days      
Operating lease, weighted-average discount rate (percentage) 6.75% 6.75%      
Houston, Texas          
Property, Plant and Equipment [Line Items]          
Office space area of leased premises (in sqft or acres) | ft² 17,000 17,000      
Jennings, Louisiana          
Property, Plant and Equipment [Line Items]          
Office space area of leased premises (in sqft or acres) | a 180 180      
Jennings, Louisiana | Prospect Shipyard          
Property, Plant and Equipment [Line Items]          
Lease renewal options | Renewal_options 2 2      
Lease renewal term 10 years 10 years      
Lake Charles, Louisiana          
Property, Plant and Equipment [Line Items]          
Office space area of leased premises (in sqft or acres) | a 10 10      
Lake Charles, Louisiana | Prospect Shipyard          
Property, Plant and Equipment [Line Items]          
Lease renewal options | Renewal_options 3 3      
Lease renewal term 5 years 5 years      
Accounting Standards Update 2016-02          
Property, Plant and Equipment [Line Items]          
Operating lease, right-of-use asset         $ 7,100
Present value of lease liabilities         5,200
Accounting Standards Update 2016-02 | Off-Market Favorable Lease          
Property, Plant and Equipment [Line Items]          
Operating lease, right-of-use asset         $ 1,900