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Vessels and subsidiaries - Vessels and time charter contracts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment |  |
As of end of period | $ 0 | $ 114,759
Net book value of vessels and time charter contracts | 1,665,810 | 1,444,146
Total Cost [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | 1,810,158 | 1,568,729
Additions | 15,373 | 390,471
Transferred from vessels under construction | 336,890 | 92,964
Transferred to asset held for sale | 0 | (23,321)
Disposals | (90,965) | (218,684)
As of end of period | 2,071,456 | 1,810,158
Total Accumulated Depreciation and Impairment [Member] |  |
Property, Plant and Equipment |  |
Transferred to asset held for sale | 0 | 2,570
Disposals | 67,125 | 127,534
As of end of period | (405,647) | (366,013)
As of beginning of period | (366,013) | (391,209)
Charge for the period | (103,259) | (96,367)
Impairment charges | (3,500) | (8,540)
Vessel Cost [Member] |  |
Property, Plant and Equipment |  |
Transferred from vessels under construction | 325,004 | 91,264
Transferred to asset held for sale | 0 | (21,585)
Disposals | (84,848) | (203,123)
As of end of period | 2,007,385 | 1,767,117
As of beginning of period | 1,767,117 | 1,534,496
Additions | 113 | 366,064
Vessel Accumulated Depreciation and impairment [Member] |  |
Property, Plant and Equipment |  |
Transferred to asset held for sale | 0 | 2,014
Disposals | 62,224 | 116,873
As of end of period | (391,894) | (359,066)
As of beginning of period | (359,066) | (384,520)
Charge for the period | (91,551) | (84,893)
Impairment charges | (3,500) | (8,540)
Vessel Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 1,615,492 | 1,408,051
Drydock Cost [Member] |  |
Property, Plant and Equipment |  |
Transferred from vessels under construction | 6,800 | 1,700
Transferred to asset held for sale | 0 | (1,736)
Disposals | (6,117) | (15,562)
As of end of period | 44,818 | 36,441
As of beginning of period | 36,441 | 27,632
Additions | 7,695 | 24,406
Drydock Accumulated Depreciation and impairment [Member] |  |
Property, Plant and Equipment |  |
Transferred to asset held for sale | 0 | 556
Disposals | 4,902 | 10,661
As of end of period | (9,171) | (3,731)
As of beginning of period | (3,731) | (4,451)
Charge for the period | (10,342) | (10,497)
Drydock Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 35,647 | 32,710
Scrubbers Cost [Member] |  |
Property, Plant and Equipment |  |
Transferred from vessels under construction | 5,086 | 0
As of end of period | 12,652 | 0
As of beginning of period | 0 | 0
Additions | 7,566 | 0
Scrubbers Accumulated Depreciation and Impairment [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | 0 | 0
Charge for the period | (388) | 0
As of end of period | (388) | 0
Scrubbers Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 12,264 | 0
Time Charter Contracts Cost [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | 6,600 | 6,600
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 | (3,215) | (2,237)
Charge for the period. | (978) | (978)
As of end of period | (4,193) | (3,215)
Time Charter Contracts Net Book Value [Member] |  |
Property, Plant and Equipment |  |
As of end of period | 2,407 | 3,385
Vessels Under Construction [Member] |  |
Property, Plant and Equipment |  |
As of beginning of period | 114,759 | 43,638
Additions | 222,131 | 164,085
Transferred to vessels | (336,890) | (92,964)
As of end of period | $ 0 | $ 114,759

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