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VESSELS AND CAPITALIZED DRY-DOCKING (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract]      
Balance $ 1,445,000    
Balance 1,484,200 $ 1,452,100 $ 1,445,000
Vessels and capitalized dry docking      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,396,600    
Balance 1,418,100 1,399,500 1,396,600
Vessels and capitalized dry docking | Right-of-use assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 26,500    
Balance 25,600 27,500 26,500
Vessels and capitalized dry docking | Gross      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 1,886,300 1,726,600 1,726,600
Additions 27,900 97,800 162,700
Disposals (8,000) (4,900) (30,200)
Transferred from prepayments 67,600 63,900 81,800
Transferred to assets held-for-sale (44,200) 0 (54,600)
Balance 1,929,600 1,883,400 1,886,300
Vessels and capitalized dry docking | Depreciation:      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 327,600 264,800 264,800
Disposals (8,000) (4,900) (30,200)
Depreciation for the period 51,400 56,700 113,400
Transferred to assets held-for-sale (17,300) 0 (20,400)
Balance 353,700 316,600 327,600
Vessels and capitalized dry docking | Impairment:      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance 162,100 167,300 167,300
Impairment losses on tangible fixed assets 2,700 0 3,200
Transferred to assets held-for-sale (7,000) 0 (8,400)
Balance $ 157,800 $ 167,300 $ 162,100