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Preferred, Common Shares and Additional Paid in Capital - Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 7 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
Jan. 03, 2019
Feb. 02, 2017
Mar. 01, 2018
Dec. 31, 2016
Apr. 13, 2016
Apr. 13, 2015
May 09, 2016
Jun. 29, 2018
Jul. 11, 2014
Jul. 31, 2016
Sep. 20, 2016
Oct. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 29, 2018
Aug. 03, 2018
Jul. 06, 2018
Class of Stock [Line Items]                                    
Common shares issued                     11,976,745              
Price per share                     $ 4.3              
Proceeds from issuance of common stock                     $ 50,278   $ 0 $ 51,454 $ 50,589      
Number of shares vested                         809,500 1,049,000 783,545      
Number of shares granted                         672,500 944,000 1,035,000      
Offering expenses                         $ 2,032          
Purchase of treasury stock                         $ 3,145          
Preferred Shares                                    
Class of Stock [Line Items]                                    
Preferred Shares - Shares Authorized                         25,000,000 25,000,000        
Preferred Shares - Par Value                         $ 0.01 $ 0.01        
Preferred Shares - Shares Issued                         0 0        
Common Shares                                    
Class of Stock [Line Items]                                    
Common Shares - Shares Authorized                         300,000,000 300,000,000        
Common Shares - Par Value                         $ 0.01 $ 0.01        
Common shares issued                           6,310,272 11,976,745      
Stock issued during period, share based compensation                         868,975 1,220,825 692,595      
Issuance of shares                             138,453      
Equity Incentive Plan 2015                                    
Class of Stock [Line Items]                                    
Stock issued during period, share based compensation         131,545                          
Number of shares vested         135,230                          
Number of shares granted           135,230                        
Equity Incentive Plan 2016                                    
Class of Stock [Line Items]                                    
Stock issued during period, share based compensation       558,050                            
Number of shares vested     40,000             650,000                
Number of shares granted             690,000                      
Two Directors                                    
Class of Stock [Line Items]                                    
Stock issued during period, share based compensation                 3,000                  
Number of shares vested                 3,000                  
Number of shares granted                 3,000                  
Private placement                                    
Class of Stock [Line Items]                                    
Common shares issued   6,310,272                                
Price per share   $ 8.154                                
Proceeds from issuance of private placement   $ 50,427                                
Secondary offering                                    
Class of Stock [Line Items]                                    
Offering expenses                         $ 2,032          
Oaktree and its affiliates | Private placement                                    
Class of Stock [Line Items]                                    
Common shares issued   3,244,292                                
Share Repurchase Program                                    
Class of Stock [Line Items]                                    
Stock repurchase program, authorized amount                               $ 50,000    
Common shares repurchased                         341,363          
Common shares repurchased, Average price per Share                         $ 9.17          
Purchase of treasury stock                         $ 3,145          
Subsequent Event | Share Repurchase Program                                    
Class of Stock [Line Items]                                    
Shares cancelled 341,363                                  
OCC vessels | Common Shares                                    
Class of Stock [Line Items]                                    
Shares to acquire vessels                         3,304,735          
Songa Vessels                                    
Class of Stock [Line Items]                                    
Price per share                                   $ 13.31
Songa Vessels | Common Shares                                    
Class of Stock [Line Items]                                    
Shares to acquire vessels                         13,725,000          
Augustea Vessels                                    
Class of Stock [Line Items]                                    
Price per share                                 $ 14  
Augustea Vessels | Common Shares                                    
Class of Stock [Line Items]                                    
Shares cancelled                         53,978          
Shares to acquire vessels                         10,277,335          
Augustea Vessels | Initially Issued | Common Shares                                    
Class of Stock [Line Items]                                    
Shares to acquire vessels                         10,331,313          
Star Bright | Common Shares                                    
Class of Stock [Line Items]                                    
Shares to acquire vessels                       291,300            
Oaktree Capital Management L.P. | Secondary offering                                    
Class of Stock [Line Items]                                    
Common shares issued               5,000,000                    
Price per share               $ 13.10