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Preferred and Common Shares and Additional Paid in Capital - Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 5 Months Ended 6 Months Ended
Jan. 14, 2015
Aug. 19, 2014
May. 18, 2015
Jun. 30, 2015
Jul. 11, 2014
Jun. 30, 2014
Class of Stock [Line Items]            
Common shares offered in public offering 49,000,418   56,250,000      
Public offering price $ 5   $ 3.2      
Granted       676,150   402,167
Proceeds from issuance of common stock $ 242,211   $ 175,586 $ 418,771   $ 0
Shares to acquire business         54,104,200  
Interchart Acquisition Shares Issuance            
Class of Stock [Line Items]            
Percentage of total outstanding common shares           33.00%
Shares to acquire business           22,598
Equity Incentive Plan 2014            
Class of Stock [Line Items]            
Granted           394,167
Equity Incentive Plan 2014 | Directors            
Class of Stock [Line Items]            
Granted           8,000
Equity Incentive Plan 2014 | First Installment CEO            
Class of Stock [Line Items]            
Granted           9,333
Definite Agreements with Excel Maritime Carriers Ltd            
Class of Stock [Line Items]            
Shares to acquire vessels   29,917,312   4,257,887