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Transactions With Related Parties - Additional Information - Interchart (Details)
$ / shares in Units, $ in Thousands
6 Months Ended 9 Months Ended 12 Months Ended
Jul. 11, 2014
shares
Oct. 01, 2014
USD ($)
Oct. 01, 2014
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
shares
Jul. 31, 2014
Apr. 01, 2014
$ / shares
Related Party Transaction [Line Items]              
Shares to acquire business | shares 10,820,840            
Exchange rate EUR/USD       1.05   1.34  
Interchart Shipping Inc.              
Related Party Transaction [Line Items]              
Acquisition date       Feb. 25, 2014      
Percentage of total outstanding common shares         33.00%    
Payment to acquire business | $         $ 200    
Shares to acquire business | shares         4,520    
Fair value per share transferred | $ / shares             $ 72.55
Services Agreement | Interchart Shipping Inc.              
Related Party Transaction [Line Items]              
Annual lump sum fee   $ 525 € 500,000        
Expiration date of agreement       Oct. 01, 2014      
New Services Agreement | Interchart Shipping Inc.              
Related Party Transaction [Line Items]              
Monthly lump sum fee | $       $ 275      
Expiration date of agreement       Dec. 31, 2017