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SEGMENTAL INFORMATION - Geographical Segment Data (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Geographical segment data:      
Vessels, net $ 1,883,066 $ 2,336,144  
Revenues 80,257 102,674 $ 106,155
GHANA      
Geographical segment data:      
Disposal Group, Including Discontinued Operations, Vessels, Net, Noncurrent $ 270,959    
Vessels, net   $ 0