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Long-Term Debt, Net - Kelty Loan Agreement (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2010
Disclosure of detailed information about borrowings [line items]            
Proceeds from sale of a subsidiary     $ 0 $ 374,000 $ 5,348,000  
Interest paid     (3,309,000) (1,730,000) (2,363,000)  
Gain from sale of subsidiary     0 2,257,000 $ 0  
Borrowings     $ 41,538,000 $ 65,572,000    
Kelty Marine Limited            
Disclosure of detailed information about borrowings [line items]            
Management daily fee   $ 900,000        
Commerzbank            
Disclosure of detailed information about borrowings [line items]            
Borrowings, Face amount           $ 26,650,000
Accrued interest $ 122,000          
Proceeds from sale of a subsidiary 6,860,000          
Interest paid 40,700          
Borrowings $ 15,650,000