Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.6.0.2
Subsequent Events (Details)
Feb. 23, 2017
$ / shares
Mar. 02, 2017
USD ($)
Feb. 06, 2017
USD ($)
Dec. 31, 2016
USD ($)
vessel
Dec. 31, 2015
USD ($)
Subsequent Event [Line Items]          
Property, plant and equipment, net       $ 206,222,000 $ 200,384,000
Potentially uncollectible receivable, number of vessels under construction | vessel       2  
Current receivables       $ 20,169,000 47,060,000
Contracts in progress       26,829,000 $ 12,822,000
Subsequent Event          
Subsequent Event [Line Items]          
Dividends declared, date Feb. 23, 2017        
Dividends declared per share (in dollars per share) | $ / shares $ 0.01        
Dividends declared, payable date Mar. 24, 2017        
Dividends declared, record date Mar. 10, 2017        
Contracts Receivable          
Subsequent Event [Line Items]          
Contract receivable       0  
Customer of Shipyard | Contracts Receivable | Subsequent Event          
Subsequent Event [Line Items]          
Current receivables     $ 4,500,000    
Contracts in progress   $ 4,900,000      
South Texas Properties          
Subsequent Event [Line Items]          
Property, plant and equipment, net       $ 107,600,000