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ACCOUNTING POLICIES (Restated) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
segment
vessel
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Trading activity:      
Transfer of additional paid in capital $ (1,579)    
Percentage of voting interest acquired 50.00%    
Number of vessels in sale and leaseback transaction | vessel 5    
Number of reportable segments | segment 3    
Other operating gains and losses | Energy trading contract      
Trading activity:      
Gains and losses on trading activity $ 0 $ 4,000 $ 0
Minimum | Drydocking      
Trading activity:      
Period until next anticipated drydocking 2 years    
Maximum | Drydocking      
Trading activity:      
Period until next anticipated drydocking 5 years    
Accumulated Other Comprehensive Loss      
Trading activity:      
Transfer of additional paid in capital $ 4,424    
Additional Paid-in Capital      
Trading activity:      
Transfer of additional paid in capital (6,003)    
Out of Period Correction | Other financial Items, net      
Trading activity:      
Transfer of additional paid in capital 1,600    
Out of Period Correction | Accumulated Other Comprehensive Loss      
Trading activity:      
Transfer of additional paid in capital 4,400    
Out of Period Correction | Additional Paid-in Capital      
Trading activity:      
Transfer of additional paid in capital $ 6,000