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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 |  |

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