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TANGIBLE FIXED ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in property, plant and equipment [abstract]      
Balance $ 1,389,650    
Balance 1,384,795 $ 1,389,650  
Prepayments On Vessels [Abstract]      
Balance 44,036 72,600  
Balance 88,378 44,036 $ 72,600
Vessels and capitalized dry docking      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,343,800 1,492,000  
Balance 1,294,500 1,343,800 1,492,000
Prepayments On Vessels [Abstract]      
Balance 44,100 72,600 34,700
Additions 44,300 76,900 142,500
Transferred to/from other items   (105,400) (104,600)
Balance 88,400 44,100 72,600
Vessels and capitalized dry docking | Property, plant and equipment subject to operating leases      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 12,400 13,100  
Balance 28,600 12,400 13,100
Vessels and capitalized dry docking | Gross      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,697,400 1,567,500 530,100
Additions 103,100 40,800 112,000
Additions from business combinations     857,400
Disposals (14,300) (16,300) (18,600)
Transferred to/from other items   105,400 104,600
Transferred to assets held-for-sale (59,600)   (18,000)
Balance 1,726,600 1,697,400 1,567,500
Vessels and capitalized dry docking | Accumulated depreciation, amortisation and impairment [member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 180,000 75,500 27,900
Disposals (14,300) (15,900) (18,600)
Depreciation for the year 113,600 120,400 66,500
Transferred to assets held-for-sale (20,800)   (300)
Balance 258,500 180,000 75,500
Vessels and capitalized dry docking | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 173,600 0 0
Impairment losses on tangible fixed assets   173,600 0
Balance 173,600 173,600 0
Other property, plant and equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,800 2,500  
Balance 1,900 1,800 2,500
Other property, plant and equipment | Property, plant and equipment subject to operating leases      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 0 0  
Balance 0 0 0
Other property, plant and equipment | Gross      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 2,700 3,200  
Additions 1,000 1,100 900
Additions from business combinations     2,500
Disposals (100) (1,600) (200)
Balance 3,600 2,700 3,200
Other property, plant and equipment | Accumulated depreciation, amortisation and impairment [member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 900 700  
Disposals (100) (1,600) (200)
Depreciation for the year 900 1,800 900
Balance $ 1,700 $ 900 $ 700