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TANGIBLE FIXED ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract]      
Balance $ 1,384,795    
Balance 1,445,022 $ 1,384,795  
Prepayments On Vessels [Abstract]      
Balance 88,378    
Balance 45,491 88,378  
Vessels and capitalized dry docking      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,294,500 1,343,800  
Balance 1,396,600 1,294,500 $ 1,343,800
Prepayments On Vessels [Abstract]      
Balance 88,400 44,100 72,600
Additions 38,900 44,300 76,900
Transferred to/from other items (81,800) 0 (105,400)
Balance 45,500 88,400 44,100
Vessels and capitalized dry docking | Property, plant and equipment subject to operating leases      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 28,600 12,400  
Balance 26,500 28,600 12,400
Vessels and capitalized dry docking | Gross      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,726,600 1,697,400 1,567,500
Additions 162,700 103,100 40,800
Disposals (30,200) (14,300) (16,300)
Transferred to/from other items 81,800 0 105,400
Transferred to assets held-for-sale (54,600) (59,600) 0
Balance 1,886,300 1,726,600 1,697,400
Vessels and capitalized dry docking | Depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 264,800 180,000 75,500
Disposals (30,200) (14,300) (15,900)
Depreciation for the year 113,400 113,600 120,400
Transferred to assets held-for-sale (20,400) (14,500) 0
Balance 327,600 264,800 180,000
Vessels and capitalized dry docking | Accumulated impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 167,300 173,600 0
Impairment losses on tangible fixed assets 3,200 3,600 173,600
Transferred to assets held-for-sale (8,500) (9,900) 0
Balance 167,300 167,300 173,600
Other property, plant and equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,900 1,800  
Balance 3,000 1,900 1,800
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 3,600 2,700 3,200
Additions 2,200 1,000 1,100
Disposals 0 (100) (1,600)
Balance 5,800 3,600 2,700
Other property, plant and equipment | Depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,700 900 700
Disposals 0 (100) (1,600)
Depreciation for the year 1,100 900 1,800
Balance $ 2,800 $ 1,700 $ 900