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TANGIBLE FIXED ASSETS (Detail Textuals) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense relates to administrative expense $ 114,480 $ 114,451 $ 122,215
Vessels and capitalized dry docking      
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized dry-docking costs 67,500 68,100 80,400
Other property, plant and equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expense relates to administrative expense $ 1,100 $ 900 $ 1,800