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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