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Preferred and Common Shares and Additional Paid in Capital - Equity (Details) $ / shares in Units, $ in Thousands |  | 1 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 |  |
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Jan. 14, 2015 USD ($) $ / shares shares | Feb. 02, 2017 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares | Apr. 13, 2016 shares | Apr. 13, 2015 shares | May 09, 2016 shares | May 18, 2015 USD ($) $ / shares shares | Jun. 20, 2016 shares | Jul. 11, 2014 shares | Jul. 31, 2016 shares | Sep. 09, 2016 shares | Sep. 20, 2016 USD ($) $ / shares shares | Oct. 28, 2015 shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Nov. 23, 2009 $ / shares shares | Nov. 22, 2009 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,049,000 | 783,545 | 78,833 |  |
Common shares offered in public offering | 9,800,084 | 6,310,272 |  |  |  |  | 11,250,000 |  |  |  |  | 11,976,745 |  |  |  |  |  |
Price per share | $ / shares | $ 25 | $ 8.154 |  |  |  |  | $ 16 |  |  |  |  | $ 4.3 |  |  |  |  |  |
Proceeds from issuance of common stock | $ | $ 242,211 |  |  |  |  |  | $ 175,586 |  |  |  |  | $ 50,278 |  | $ 51,454 | $ 50,589 | $ 418,771 |  |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 944,000 | 1,035,000 | 135,230 |  |
Proceeds from issuance of private placement | $ |  | $ 50,427 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock - Shares Authorized |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  | 25,000,000 | 25,000,000 |  |  |
Preferred Stock - Par Value | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Preferred Stock - Shares Issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock - Shares Authorized |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  | 300,000,000 | 300,000,000 |  | 300,000,000 | 100,000,000
Common Stock - Par Value | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01
Common shares offered in public offering |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,310,272 | 11,976,745 | 21,050,084 |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,220,825 | 692,595 |  |  |
Issuance of shares, representing the third and the fourth installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,453 | 34,234 |  |
Reverse stock split |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of the reverse stock split |  |  |  |  |  |  |  |  |  |  |  |  |  | Effective as of June 20, 2016, pursuant to the June 2016 Reverse Split, the Company effected a five-for-one reverse stock split of its common shares. |  |  |  |
Reverse stock split, Conversion ratio |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Shares converted |  |  |  |  |  |  |  | 219,778,437 |  |  |  |  |  |  |  |  |  |
Number of shares after reverse stock split |  |  |  |  |  |  |  | 43,955,659 |  |  |  |  |  |  |  |  |  |
Oceanbulk Maritime S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares, representing the third and the fourth installment |  |  |  |  |  |  |  |  |  |  | 138,453 |  | 34,234 |  |  |  |  |
Oaktree and its affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares offered in public offering |  | 3,244,292 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plan 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  | 135,230 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  | 131,545 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  | 135,230 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plan 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  |  |  |  | 650,000 |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  | 558,050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  | 690,000 |  |  |  |  |  |  |  |  |  |  |  |
Two directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Excel Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to acquire vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 851,577 |  |

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