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TANGIBLE FIXED ASSETS - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense relates to administrative expense $ 110,124 $ 114,480 $ 114,451
Vessels and capitalized dry docking      
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized dry-docking costs 60,700 67,500 68,100
Other plant and operating equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense relates to administrative expense $ 1,000 $ 1,100 $ 900