Annual report pursuant to Section 13 and 15(d)

REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Contract Assets and Liabilities (Details)

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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Contract Assets and Liabilities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
vessel
Sep. 30, 2018
vessel
Dec. 31, 2017
USD ($)
Revenue from Contract with Customer [Abstract]      
Costs incurred on uncompleted contracts $ 253,871   $ 266,902
Estimated profit (loss) earned to date (35,470)   (26,954)
Prepaid subcontractor costs 2,368   0
Sub-total 220,769   239,948
Billings to date (190,588)   (224,329)
Deferred revenue (4,592)   0
Contract assets 29,982   28,373
Contract liabilities (16,845)   (12,754)
Sub-total 13,137   15,619
Contract assets, noncurrent 12,452   0
Total $ 25,589   15,619
Number of multi-purpose service vessels | vessel 2 2  
Contract with customer, liability, revenue recognized $ 5,100    
Contract with customer, liability, accrued contract losses, current $ 2,400   $ 7,600