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v3.20.1

Significant accounting policies (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Voyage revenues | $ 821,365,000 | $ 651,561,000 | $ 331,976,000 |  |
Provision for doubtful debts | $ 1,607,000 | 722,000 | 0 |  |
Vessels' depreciation method | straight-line basis |  |  |  |
Vessel's useful life | 25 years |  |  |  |
Vessel salvage value per LWT | $ 300 | 300 |  |  |
Revenue recognition method | straight-line basis |  |  |  |
Number of reportable segments | 1 |  |  |  |
Finance Lease, Right-of-Use Asset |  | 1,047,780,000 |  |  |
Finance Lease, Liability |  | 609,737,000 |  |  |
Weighted-average discount rate | 5.66% |  |  |  |
Operating Lease, Right-of-Use Asset | $ 1,216,000 | 0 |  |  |
Operating Lease, Liability | 1,216,000 | 0 |  |  |
Operating Lease, Expense | $ 126,813,000 | 92,896,000 | 5,325,000 |  |
Operating Lease, Weighted Average Remaining Lease Term | 2 years 2 months 1 day |  |  |  |
Net cash provided by / (used in) Operating Activities | $ 88,525,000 | 169,009,000 | 82,804,000 |  |
Net cash provided by / (used in) Investing Activities | (279,837,000) | (325,327,000) | (127,101,000) |  |
Charter-in vessels |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Voyage revenues | 185,311,000 | 127,618,000 | 6,153,000 |  |
Revenue recognized from subleases | 15,253,000 | 18,661,000 | 3,005,000 |  |
Office rental arrangements |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset | 1,216,000 |  |  |  | $ 1,198,000
Operating Lease, Liability | $ 1,216,000 |  |  |  | $ 1,198,000
Discount rate | 4.00% |  |  |  |
Operating Lease, Expense | $ 352,000 | $ 403,000 |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 3 years 10 months 27 days |  |  |  |
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 | 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) |

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