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ACCOUNTING POLICIES (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounting Policies [Abstract]      
Revenue from loss of hire insurance $ 400,000 $ 300,000 $ 0
Accumulated Other Comprehensive Loss:      
Unrealized net loss on qualifying cash flow hedging instruments (19,462,000) (20,964,000)  
Losses associated with pensions, net of tax recoveries (15,486,000) (12,347,000)  
Tax recoveries from losses associated with pensions 400,000     
Accumulated other comprehensive loss (34,948,000) (33,311,000)  
Other operating gains and losses | Energy trading contract
     
Trading activity:      
Gains and losses on trading activity $ 2,000,000 $ (5,300,000) $ 0
Maximum
     
Trading activity:      
Ownership percentage of unlisted investments 20.00%