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Vessels and subsidiaries - Vessels and time charter contracts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment |  |
Advances for vessels under construction | $ 114,759 | $ 43,638
Net book value of vessels and time charter contracts | 1,444,146 | 1,177,521
Total Cost [Member] |  |
Property, Plant and Equipment |  |
Vessels and time charter contracts cost | 1,568,729 |
Additions | 390,471 | 11,093
Transferred from vessels under construction | 92,964 | 385,251
Transferred to asset held for sale | (23,321) | (62,275)
Disposals | (218,684) | (106,920)
Vessels and time charter contracts cost | 1,810,158 | 1,568,729
Total Accumulated Depreciation and Impairment [Member] |  |
Property, Plant and Equipment |  |
Transferred to asset held for sale | 2,570 | 39,059
Impairment charge | 8,540 | 78,200
Disposals | 127,534 | 86,985
As of end of period | (366,013) | (391,209)
As of beginning of period | (391,209) |
Charge for the period | (96,367) | (84,069)
Impairment charge | (8,540) | (78,200)
Vessel Cost [Member] |  |
Property, Plant and Equipment |  |
Transferred from vessels under construction | 91,264 | 376,751
Transferred to asset held for sale | (21,585) | (62,275)
Disposals | (203,123) | (92,344)
As of end of period | 1,767,117 | 1,534,496
As of beginning of period | 1,534,496 |
Additions | 366,064 | 0
Vessel Accumulated Depreciation and impairment [Member] |  |
Property, Plant and Equipment |  |
Transferred to asset held for sale | 2,014 | 39,059
Disposals | 116,873 | 72,409
As of end of period | (359,066) | (384,520)
As of beginning of period | (384,520) |
Charge for the period | (84,893) | (74,385)
Impairment charge | (8,540) | (78,200)
Impairment charge | 8,540 | 78,200
Vessel Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 1,408,051 | 1,149,976
Drydock Cost [Member] |  |
Property, Plant and Equipment |  |
Transferred from vessels under construction | 1,700 | 8,500
Transferred to asset held for sale | (1,736) | 0
Disposals | (15,562) | (11,477)
As of end of period | 36,441 | 27,632
As of beginning of period | 27,632 |
Additions | 24,406 | 11,093
Drydock Accumulated Depreciation and impairment [Member] |  |
Property, Plant and Equipment |  |
Transferred to asset held for sale | 556 | 0
Disposals | 10,661 | 11,477
As of end of period | (3,731) | (4,451)
As of beginning of period | (4,451) |
Charge for the period | (10,497) | (8,465)
Drydock Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 32,710 | 23,181
Time Charter Contracts Cost [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | 6,600 |
Disposals of time charter contracts | 0 | (3,100)
As of end of period | 6,600 | 6,600
Time Charter Contracts Accumulated Depreciation and impairment [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | (2,237) |
Charge for the period. | (978) | (1,219)
Disposals | 0 | 3,100
As of end of period | (3,215) | (2,237)
Time Charter Contracts Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 3,385 | 4,363
Vessels Under Construction [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | 43,638 |
Additions | 164,085 | 219,988
Impairment charge | 0 | (6,500)
Transferred to vessels | (92,964) | (385,251)
Advances for vessels under construction | 114,759 | 43,638
Impairment charge | $ 0 | $ 6,500

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