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Basis of Presentation and General Information - The Excel Transactions (Details) $ in Thousands | 8 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 19, 2014 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares
Vessels [Line Items] |  |  |  |
Payments to acquire property plant and equipment |  | $ 396,154 | $ 473,917 | $ 518,447
Excel Vessels |  |  |  |
Vessels [Line Items] |  |  |  |
Number of vessels acquired | 34 |  |  |
Payments to acquire property plant and equipment | $ 288,391 |  | $ 39,475 | $ 248,751
Shares to acquire vessels | shares | 5,983,462 |  | 851,577 | 5,131,885
Capesize vessels |  |  |  |
Vessels [Line Items] |  |  |  |
Number of vessels acquired | 6 |  |  |
Kamsarmax vessels |  |  |  |
Vessels [Line Items] |  |  |  |
Number of vessels acquired | 14 |  |  |
Panamax vessels |  |  |  |
Vessels [Line Items] |  |  |  |
Number of vessels acquired | 12 |  |  |
Handymax vessels |  |  |  |
Vessels [Line Items] |  |  |  |
Number of vessels acquired | 2 |  |  |
Excel Vessel Bridge Facility |  |  |  |
Vessels [Line Items] |  |  |  |
Maximum borrowing capacity |  | $ 231,000 |  |

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