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Preferred and Common Shares and Additional Paid in Capital - Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 14, 2015 | Feb. 20, 2014 | Mar. 20, 2015 | Mar. 21, 2014 | Mar. 21, 2013 | May. 03, 2013 | May. 18, 2015 | May. 31, 2014 | Jul. 11, 2014 | Jun. 27, 2013 | Jul. 31, 2014 | Jul. 25, 2013 | Aug. 19, 2014 | Sep. 11, 2013 | Oct. 07, 2013 | Oct. 28, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 23, 2009 | Nov. 22, 2009
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 394,167 | 449,842 | 21,333 |  |  |
Offering expenses |  |  |  |  |  |  |  |  |  |  |  | $ 2,167 |  |  | $ 2,716 |  | $ 974 | $ 0 | $ 4,883 |  |  |
Public offering, price per share | $ 5 |  |  |  |  |  | $ 3.2 |  |  |  |  |  |  |  | $ 8.8 |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 242,211 |  |  |  |  |  | $ 175,586 |  |  |  |  | $ 77,898 |  |  | $ 68,124 |  | $ 418,771 | $ 0 | $ 150,905 |  |  |
Common shares offered in public offering | 49,000,418 |  |  |  |  |  | 56,250,000 |  |  |  |  | 15,338,861 |  |  | 8,050,000 |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 676,150 | 586,009 | 279,333 |  |  |
Shares to acquire business |  |  |  |  |  |  |  |  | 54,104,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock - Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 | 25,000,000 |  |  |  |
Preferred Stock - Par Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |
Preferred Stock - Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock - Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 | 300,000,000 |  |  | 300,000,000 | 100,000,000
Common Stock - Par Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 | $ 0.01
Common Stock - Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,105,712 | 109,426,236 | 29,059,671 | 5,400,810 |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,257,887 | 580,342 | 270,000 |  |  |
Common shares offered in public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,250,418 |  | 23,388,861 |  |  |
Equity Incentive Plan 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  | 239,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 239,333 |  |  |  |  |  |  |  |
Granted |  |  |  |  | 239,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plan 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  | 394,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  | 394,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  | 394,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Former Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,667 |  |  |
Company's former director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oceanbulk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to acquire business |  |  |  |  |  |  |  |  | 48,395,766 |  |  |  |  |  |  |  |  |  |  |  |  |
Pappas Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to acquire business |  |  |  |  |  |  |  |  | 3,592,728 |  |  |  |  |  |  |  |  |  |  |  |  |
Heron Ventures Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to acquire vessels |  |  |  |  |  |  |  |  | 2,115,706 |  |  |  |  |  |  |  |  |  |  |  |  |
Interchart Shipping Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total outstanding common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |
Shares to acquire business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,598 |  |  |  |
Oceanbulk Maritime S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares, representing the third installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171,171 |  |  |  |  |  |
Renewal consultancy agreements | CEO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  | 28,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal consultancy agreements | First installment | CEO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,333 |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  | 9,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement to terminate the consultancy agreement | Former Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  |  |  | 168,842 |  |  |  |  |  |  |  |  |  |  |
Excel Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to acquire vessels |  |  |  |  |  |  |  |  |  |  |  |  | 29,917,312 |  |  |  | 4,257,887 | 25,659,425 |  |  |  |

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