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Significant accounting policies and recent accounting pronouncements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Vessels' depreciation method | straight-line basis |  |
Vessel's useful life | 25 years |  |
Vessel salvage value per LWT | $ 300 | $ 300 |
Fleet utilization assumption | 98.00% |  |
Inflation assumption | 3.00% |  |
Revenue recognition method | straight-line basis |  |
Voyage revenues | $ 651,561,000 | 331,976,000 | $ 221,987,000
Deferred revenue | 10,855,000 | 7,229,000 |
Voyage expenses | 121,596,000 | 64,682,000 | 65,821,000
Charter-in hire expenses | 92,896,000 | 5,325,000 | 3,550,000
Increase/ (Decrease) in trade accounts receivable | 22,266,000 | 5,949,000 | 1,683,000
Increase/ (Decrease) in deferred revenue | 2,489,000 | 5,169,000 | (405,000)
Increase/ (Decrease) in deferred assets | 7,545,000 | 43,000 | (3,142,000)
Net cash provided by / (used in) Operating Activities | 169,009,000 | 82,804,000 | (33,232,000)
Net cash provided by / (used in) Investing Activities | (325,327,000) | (127,101,000) | (13,425,000)
Effect of Standard Adoption | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Voyage revenues | (667,000) |  |
Deferred revenue | (1,812,000) | (1,137,000) |
Voyage expenses | 441,000 |  |
Charter-in hire expenses | 612,000 |  |
Increase/ (Decrease) in trade accounts receivable | 22,264,000 |  |
Increase/ (Decrease) in deferred revenue | 2,489,000 |  |
Effect of Standard Adoption | ASU 2016-18 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net cash provided by / (used in) Operating Activities |  | 1,834,000 | (216,000)
Net cash provided by / (used in) Investing Activities |  | 249,000 | 209,000
Balances without Standard Adoption | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Voyage revenues | 652,228,000 |  |
Deferred revenue | 9,043,000 |  |
Voyage expenses | 122,037,000 |  |
Charter-in hire expenses | 93,508,000 |  |
Balances without Standard Adoption | ASU 2016-18 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net cash provided by / (used in) Operating Activities |  | 80,970,000 | (33,448,000)
Net cash provided by / (used in) Investing Activities |  | (126,852,000) | $ (13,216,000)
Forecast | Effect of Standard Adoption | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Voyage revenues | 4,202,000 |  |
Voyage expenses and charter-in hire expenses | 2,067,000 |  |
Voyage expenses | 1,455,000 |  |
Charter-in hire expenses | 612,000 |  |
Revenue contracts | Effect of Standard Adoption | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase/ (Decrease) in deferred assets | $ 791,000 |  |
Voyage in progress | Effect of Standard Adoption | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred revenue |  | 4,579,000 |
Deferred expenses |  | $ 1,263,000 |

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