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Basis of Presentation and General Information (Details) | 3 Months Ended | 6 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Jun. 20, 2016 | Jul. 11, 2014 USD ($) $ / shares shares | Nov. 05, 2014 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Aug. 19, 2014
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Date of Incorporation |  |  |  |  | Dec. 13, 2006 |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  | $ 396,154,000 | $ 473,917,000 | $ 518,447,000 |  |
Write-off of deferred finance costs |  |  | $ 3,003,000 |  |  |  |  |  |
Average closing market price | $ / shares |  |  | $ 59.27 |  |  |  |  |  |
Interest expense |  |  |  |  | 40,449,000 | 35,969,000 | 15,362,000 |  |
Acquisition related costs |  |  | $ 9,364,000 |  |  |  |  |  |
Shares to acquire business | shares |  |  | 10,820,840 |  |  |  |  |  |
Daily Management Fee |  |  |  |  |  |  | 750 |  |
Share based compensation |  |  | $ 1,808,000 |  | $ 4,166,000 | $ 2,684,000 | 5,834,000 |  |
Reverse stock split |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split, Conversion ratio |  | 5 |  |  |  |  |  |  |
Oceanbulk |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Shares to acquire business | shares |  |  | 9,679,153 |  |  |  |  |  |
Heron Ventures Ltd |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  | 25,000,000 |  |
Shares to acquire vessels | shares |  |  | 423,141 |  |  |  |  |  |
Value of common shares issued for acquisition of Heron Vessels |  |  |  |  |  |  | $ 25,080,000 |  |
Pappas Companies |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Shares to acquire business | shares |  |  | 718,546 |  |  |  |  |  |
Vessels in operation |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Assets fair value adjustment |  |  | $ 79,465,000 |  |  |  |  |  |
Vessels in operation | Oceanbulk |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  | 12 |  |  |  |  |  |
Vessels under construction |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Assets fair value adjustment |  |  | $ 158,523,000 |  |  |  |  |  |
Vessels under construction | Oceanbulk |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Number of contracts for Newbuildings acquired |  |  | 25 |  |  |  |  |  |
Kamsarmax vessels |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  |  |  |  |  |  |  | 14
Kamsarmax vessels | Heron Ventures Ltd |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  | 2 |  |  |  |  |  |
Star Gwyneth |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
DWT |  |  |  |  | 82,790 |  |  |  |
Year Built |  |  |  |  | 2006 |  |  |  |
Star Angelina |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
DWT |  |  |  |  | 82,981 |  |  |  |
Year Built |  |  |  |  | 2006 |  |  |  |
ABYO Oprah |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
DWT |  |  | 82,551 |  |  |  |  |  |
ABYO Audrey |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
DWT |  |  | 175,125 |  |  |  |  |  |
Serenity I |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
DWT |  |  |  |  |  |  | 53,688 |  |
Daily Management Fee | $ 500 |  |  |  |  |  |  |  |
Year Built |  |  |  |  |  |  | 2006 |  |
Astakos |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
DWT |  |  |  |  | 58,722 |  |  |  |
Year Built |  |  |  |  | 2012 |  |  |  |
Heron Convertible Loan |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Convertible loan receivable, outstanding amount |  |  | $ 23,680,000 |  |  |  |  |  |
Conversion ratio |  |  |  | 0.5 |  |  |  |  |
Write off, Loan receivable |  |  | 23,680,000 |  |  |  |  |  |
Convertible loan receivable, outstanding amount net of write-offs |  |  | 0 |  |  |  |  |  |
Above market time charters | Madredeus and Amami |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Above market time charters |  |  | $ 1,967,000 |  |  |  |  |  |
Number of time charters |  |  | 2 |  |  |  |  |  |
Business combination adjustments |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 1,816,000 | $ 1,412,000 |
Acquisition related costs |  |  |  |  |  |  | $ 12,757,000 |  |
Significant charterers |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | $ 452,000 |  |  |  |

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