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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