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ACCOUNTING POLICIES (Details) (USD $)
 0 Months Ended 12 Months Ended
Aug. 31, 2010
segments
Dec. 31, 2012
segments
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]        
Revenue from loss of hire insurance   $ 2,100,000 $ 400,000 $ 300,000
Accumulated Other Comprehensive Loss:        
Unrealized net loss on qualifying cash flow hedging instruments   (6,832,000) (19,462,000)  
Unrealized gain on available-for-sale securities   5,911,000 0  
Losses associated with pensions, net of tax recoveries of $0.3 million (2011: $0.4 million)   (17,809,000) (15,486,000)  
Accumulated other comprehensive loss   (18,730,000) (34,948,000)  
Tax recoveries from losses associated with pesnions   300,000 400,000  
Number of reportable segments 1 2    
Other operating gains and losses | Energy trading contract
        
Trading activity:        
Gains and losses on trading activity   $ 0 $ 2,000,000 $ (5,300,000)