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Long-Term Debt, Net - HSH Nordbank AG Loan Agreement (Details)
$ in Thousands
 2 Months Ended 6 Months Ended 7 Months Ended 11 Months Ended 12 Months Ended
Mar. 03, 2015
USD ($)
Jul. 10, 2017
USD ($)
Jul. 31, 2015
USD ($)
Dec. 05, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
Disclosure of detailed information about borrowings [line items]                
Proceeds from borrowings         $ 280 $ 5,950 $ 39,505  
Repayments of borrowings         4,399 3,100 45,506  
Borrowings         41,538 65,572    
Pledged cash         210 210    
Current portion of long-term borrowings         $ 41,538 $ 23,550    
HSH Nordbank AG                
Disclosure of detailed information about borrowings [line items]                
Loan Facility, Maximum borrowing capacity               $ 30,000
Borrowings, interest rate basis         LIBOR      
Proceeds from borrowings $ 29,405              
Repayments of borrowings   $ 1,000            
Borrowings Number Of Periodic Payments       2        
Pledged cash       $ 750        
Deferral fee, percentage   2.50%            
Amount deferred to the last scheduled repayment date       $ 694        
Current portion of long-term borrowings         $ 24,836      
HSH Nordbank AG | Interest periods of 3 months                
Disclosure of detailed information about borrowings [line items]                
Borrowings, adjustment to interest rate basis         3.00%      
HSH Nordbank AG | Interest periods of 1 month                
Disclosure of detailed information about borrowings [line items]                
Borrowings, adjustment to interest rate basis         3.10%      
HSH Nordbank AG | Tranche A                
Disclosure of detailed information about borrowings [line items]                
Proceeds from borrowings             8,580  
Borrowings         $ 7,051      
Borrowings Number Of Periodic Payments         8      
Borrowings Frequency Of Periodic Payment         quarterly      
Periodic payment         $ 239      
Balloon Payment to be Paid         $ 5,139      
Borrowings, maturity         December 2019      
Amount deferred to the last scheduled repayment date   $ 956            
HSH Nordbank AG | Tranche B                
Disclosure of detailed information about borrowings [line items]                
Proceeds from borrowings             10,100  
Borrowings         $ 8,617      
Borrowings Number Of Periodic Payments         8      
Borrowings Frequency Of Periodic Payment         quarterly      
Periodic payment         $ 230      
Balloon Payment to be Paid         $ 6,777      
Borrowings, maturity         December 2019      
Amount deferred to the last scheduled repayment date   920            
HSH Nordbank AG | Tranche C                
Disclosure of detailed information about borrowings [line items]                
Proceeds from borrowings             $ 10,725  
Borrowings         $ 9,269      
Borrowings Number Of Periodic Payments         8      
Borrowings Frequency Of Periodic Payment         quarterly      
Periodic payment         $ 224      
Balloon Payment to be Paid         $ 7,477      
Borrowings, maturity         December 2019      
Amount deferred to the last scheduled repayment date   $ 898            
HSH Nordbank AG | Minimum                
Disclosure of detailed information about borrowings [line items]                
Fair value of mortgaged vessels to loan outstanding balance ratio             125.00%  
Compensating Balance, Amount per vessel             $ 250  
Liquidity to indebtedness ratio   5.00%         5.00%  
Amount of equity to be raised   $ 1,800            
Market Adjusted Net Worth   $ 30,000         $ 30,000  
HSH Nordbank AG | Maximum                
Disclosure of detailed information about borrowings [line items]                
Total liabilities to market adjusted total assets ratio             75.00%  
Credit Suisse AG                
Disclosure of detailed information about borrowings [line items]                
Repayments of borrowings $ 30,000   $ 5,000