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ACCOUNTING POLICIES (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
segment
vessel
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Trading activity:      
Quantifying Misstatement in Current Year Financial Statements, Amount   $ (1,579)  
Percentage of voting interest acquired 50.00%    
Number of vessels in sale and leaseback transaction | vessel 6    
Number of reportable segments | segment 4    
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:      
Quantifying Misstatement in Current Year Financial Statements, Amount   4,424  
Additional Paid-in Capital      
Trading activity:      
Quantifying Misstatement in Current Year Financial Statements, Amount   (6,003)  
Out of Period Correction | Interest Expense [Member]      
Trading activity:      
Quantifying Misstatement in Current Year Financial Statements, Amount $ (13,200)    
Out of Period Correction | Other financial Items, net      
Trading activity:      
Quantifying Misstatement in Current Year Financial Statements, Amount 5,900 $ 5,900 $ 3,300
Asset Under Development [Member] | Out of Period Correction      
Trading activity:      
Quantifying Misstatement in Current Year Financial Statements, Amount $ 13,200