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Basis of Presentation and General Information - The Excel Transactions (Details) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Aug. 19, 2014 USD ($) shares | Jun. 30, 2015 USD ($) shares | Jun. 30, 2014 USD ($)
Vessels [Line Items] |  |  |
Payments to acquire property plant and equipment |  | $ 317,538 | $ 74,267
Definite Agreements with Excel Maritime Carriers Ltd |  |  |
Vessels [Line Items] |  |  |
Vessels Acquired | 34 |  |
Payments to acquire property plant and equipment | $ 288,391 |  |
Shares to acquire vessels | shares | 29,917,312 | 4,257,887 |
Capesize vessels | Definite Agreements with Excel Maritime Carriers Ltd |  |  |
Vessels [Line Items] |  |  |
Vessels Acquired | 6 |  |
Kamsarmax vessels | Definite Agreements with Excel Maritime Carriers Ltd |  |  |
Vessels [Line Items] |  |  |
Vessels Acquired | 14 |  |
Panamax vessels | Definite Agreements with Excel Maritime Carriers Ltd |  |  |
Vessels [Line Items] |  |  |
Vessels Acquired | 12 |  |
Handymax vessels | Definite Agreements with Excel Maritime Carriers Ltd |  |  |
Vessels [Line Items] |  |  |
Vessels Acquired | 2 |  |

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