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Preferred and Common Shares and Additional Paid in Capital - Equity (Details) $ / shares in Units, $ in Thousands |  | 4 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 14, 2015 USD ($) $ / shares shares | Apr. 30, 2016 shares | May 18, 2015 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) | Jun. 20, 2016 shares | Jun. 30, 2015 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |
Common shares offered in public offering | 9,800,084 |  | 11,250,000 |  |  |
Public offering, price per share | $ / shares | $ 25 |  | $ 16 |  |  |
Proceeds from issuance of common stock | $ | $ 242,211 |  | $ 175,586 | $ 0 |  | $ 418,771
Excel Vessels |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares to acquire vessels |  |  |  |  |  | 851,577
Vessels Delivered |  |  |  |  |  | 6
Equity Incentive Plan 2015 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock issued during period, share based compensation |  | 134,545 |  |  |  |
Reverse stock split |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Description of the reverse stock split |  |  |  | Effective June 20, 2016, the Company effected a 5-for-1 reverse stock split on its issued and outstanding common stock (Note 9). |  |
Reverse stock split, Conversion ratio |  |  |  |  | 5 |
Shares converted |  |  |  |  | 219,788,952 |
Shares issued |  |  |  |  | 43,955,659 |

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