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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Retained Earnings [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Retained Earnings [Member]
Common Stock [Member]
Common Stock [Member]
OCC Vessels [Member]
Common Stock [Member]
Songa Vessels [Member]
Common Stock [Member]
Augustea Vessels [Member]
Common Stock [Member]
E.R. Vessels [Member]
Common Stock [Member]
Delphin Vessels [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
OCC Vessels [Member]
Additional Paid-in Capital [Member]
Songa Vessels [Member]
Additional Paid-in Capital [Member]
Augustea Vessels [Member]
Additional Paid-in Capital [Member]
E.R. Vessels [Member]
Additional Paid-in Capital [Member]
Delphin Vessels [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Total
OCC Vessels [Member]
Songa Vessels [Member]
Augustea Vessels [Member]
E.R. Vessels [Member]
Delphin Vessels [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Songa Vessels [Member]
Beginning balance, value at Dec. 31, 2017   $ (1,036,303) $ 642           $ 2,123,108             $ 1,088,052           $ 605    
Common Stock, Shares, Issued at Dec. 31, 2017     64,160,004                                          
Cumulative effect of accounting change $ (2,259)                           $ (2,259)                  
Net income / (loss)   58,397                           58,397                
Other comprehensive income / (loss)                               (605)           (605)    
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13)     868,975                                          
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13)     $ 8           8,064             8,072                
Secondary offering expenses                 (2,032)             (2,032)                
Acquisition of vessels (Notes 3, 5 and 10)       3,304,735 13,725,000 10,277,335 291,300                                  
Acquisition of vessels (Notes 3, 5 and 10)       $ 33 $ 137 $ 103 $ 3     $ 42,929 $ 182,543 $ 143,780 $ 4,037       $ 42,962 $ 182,680 $ 143,883 $ 4,040        
Purchase of treasury stock (Note 10)                               (3,145)             $ (3,145)  
Ending balance, value at Dec. 31, 2018   (980,165) $ 926           2,502,429             1,520,045             (3,145)  
Common Stock, Shares, Issued at Dec. 31, 2018     92,627,349                                          
Net income / (loss)   (16,201)                           (16,201)                
Other comprehensive income / (loss)                                              
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13)     883,700                                          
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13)     $ 9           7,934             7,943                
Acquisition of vessels (Notes 3, 5 and 10)             999,336 4,503,370                                
Acquisition of vessels (Notes 3, 5 and 10)             $ 10 $ 45         $ 10,055 $ 47,470           $ 10,065 $ 47,515      
Purchase of treasury stock (Note 10)     $ (29)           (23,546)             (20,430)             3,145  
Dividend declared and paid ($0.05 per share) (Note 10)   (4,804)                           (4,804)                
Acquisition of Vessel, value                                   $ (93)           $ (93)
Purchase of treasury stock (Note 10)     (2,940,558)                                          
Ending balance, value at Dec. 31, 2019   (1,001,170) $ 961           2,544,342             1,544,040             (93)  
Common Stock, Shares, Issued at Dec. 31, 2019     96,073,197                                          
Net income / (loss)   9,660                           9,660                
Other comprehensive income / (loss)                               (3,993)           (3,993)    
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13)     1,073,490                                          
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13)     $ 10           4,614             4,624                
Dividend declared and paid ($0.05 per share) (Note 10)   (4,804)                           (4,804)                
Ending balance, value at Dec. 31, 2020   $ (996,314) $ 971           $ 2,548,956             $ 1,549,527           $ (3,993) $ (93)  
Common Stock, Shares, Issued at Dec. 31, 2020     97,146,687