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SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2016
Feb. 29, 2016
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
Rate
Jun. 30, 2016
USD ($)
vessels
Rate
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jul. 01, 2016
Rate
Subsequent Event [Line Items]              
Proceeds from sale of vessels and termination of charters       $ 4,932 $ (2,003) $ 42,275  
Number of offshore supply vessels | vessels       5      
Term of lease or charter       15 years      
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Proceeds from sale of vessels and termination of charters     $ 24,000        
Compensation payable (receivable) for early contract termination of charter, upfront payment (receipt)     $ 300        
Common Stock, Dividends, Per Share, Declared | $ / shares     $ 0.45        
Receivable, Interest Rate, Stated Percentage | Rate     2.25%        
Interest Rate on Paid-in-Kind Interest | Rate     4.50%        
Term of loan notes     6 years        
Compensation Received on Termination of Charters, Notes Receivable     $ 6,000        
Deep Sea [Member]              
Subsequent Event [Line Items]              
Joint Venture, Ownership Percentage | Rate       50.00%      
Receivable, Interest Rate, Stated Percentage   7.25%          
Term of loan notes   6 years          
Compensation Received on Termination of Charters, Notes Receivable   $ 11,600          
Deep Sea [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Term of lease or charter 3 years            
Profit sharing percentage | Rate             50.00%