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Transactions with Related Parties - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2011
Related Party Transaction            
Number of vessels 36          
Vessel operating expenses $ 11,629 $ 10,866 $ 11,708      
General and administrative expenses 6,234 6,253 6,608      
Executive services agreement with CGP            
Related Party Transaction            
General and administrative expenses 1,688 1,688 1,624      
Capital Ship Management Corp. | Fixed fee management agreement            
Related Party Transaction            
Vessel operating expenses 488 981 3,221      
Capital Ship Management Corp. | Floating fee management agreement            
Related Party Transaction            
Vessel operating expenses $ 10,100 8,865 7,477      
Capital Ship Management Corp. | Crude Carriers Corp. ("Crude") management agreement            
Related Party Transaction            
Number of vessels 3         5
Vessel operating expenses $ 1,041 $ 1,020 $ 1,010      
Sales and purchase fee   1.00%        
Commercial service fee   1.25%        
Management agreement termination fees       $ 10,124 $ 9,858  
Management agreement waiver terms Effective from January 1, 2017 the Manager agreed to waive going forward (i) the sale and purchase fee equal to 1% of the gross purchase or sale price upon the consummation of any purchase or sale of the three vessels and (ii) the commercial services fee equal to 1.25% of all gross charter revenues generated by each of the three vessels for commercial services rendered.