Quarterly report pursuant to Section 13 or 15(d)

Assets Held for Sale - Narrative (Details)

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Assets Held for Sale - Narrative (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
USD ($)
a
Disposal Group, Held-for-sale, Not Discontinued Operations  
Long Lived Assets Held-for-sale [Line Items]  
Property, plant and equipment held for sale $ 107,262
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations  
Long Lived Assets Held-for-sale [Line Items]  
Property, plant and equipment held for sale 104,759
Prospect Shipyard  
Long Lived Assets Held-for-sale [Line Items]  
Loss on sale of assets 259
Prospect Shipyard | Disposal Group, Held-for-sale, Not Discontinued Operations  
Long Lived Assets Held-for-sale [Line Items]  
Property, plant and equipment held for sale $ 2,503
Area of leased facility (in acres) | a 35
Impairment of assets held for sale $ 389
Prospect Shipyard | Disposal Group, Disposed of by Sale, Not Discontinued Operations  
Long Lived Assets Held-for-sale [Line Items]  
Proceeds from sale of assets $ 2,000