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Significant Accounting Policies - Revenues (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues | $ 651,561 | $ 331,976 | $ 221,987
Time charters |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues | 397,499 | 240,529 | 148,012
Voyage charters |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues | 253,812 | 102,977 | 82,306
Pool revenues |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues | $ 250 | 574 | (588)
Address commissions |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues |  | $ (12,104) | $ (7,743)

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- Definition Revenues arising from services provided to charterers according to the terms and conditions included in charter agreements. Voyage revenues may include the amortization of above/below market acquired time charter. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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