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)
ft² in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
ft²
a
renewal_options
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]      
Depreciation and amortization | $ $ 10,430 $ 12,909 $ 25,448
Lease agreement expenses | $ $ 1,900 $ 2,000 $ 2,500
Houston, Texas      
Property, Plant and Equipment [Line Items]      
Office space area of leased premises (in sqft or acres) | ft² 17    
Jennings, Louisiana      
Property, Plant and Equipment [Line Items]      
Office space area of leased premises (in sqft or acres) | a 180    
Lake Charles, Louisiana      
Property, Plant and Equipment [Line Items]      
Office space area of leased premises (in sqft or acres) | a 10    
Prospect Shipyard | Jennings, Louisiana      
Property, Plant and Equipment [Line Items]      
Lease renewal options | renewal_options 2    
Lease renewal term 10 years    
Prospect Shipyard | Lake Charles, Louisiana      
Property, Plant and Equipment [Line Items]      
Lease renewal options | renewal_options 3    
Lease renewal term 5 years