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GAIN ON SALE OF ASSETS AND TERMINATION OF CHARTERS (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Long Lived Assets Held-for-sale [Line Items]        
Loss/(gain) on sale of assets and termination of charters   $ (14) $ 114 $ (7,364)
Proceeds from sale of vessels and termination of charters   4,932 (2,003) 42,275
Vessel impairment charge   $ 0 $ 29,161 42,410
Sale of offshore supply vessel Sea Bear [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Loss/(gain) on sale of assets and termination of charters $ (14)      
Proceeds from sale of vessels and termination of charters $ 5,100      
Vessel impairment charge       $ 8,100