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ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
segments
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]        
Revenue from loss of hire insurance $ 0 $ 2,100,000 $ 400,000  
Trading activity:        
Drydocking expenditure 4,248,000 20,939,000 19,773,000  
Accumulated Other Comprehensive Loss:        
Unrealized net loss on qualifying cash flow hedging instruments 1,822,000 6,832,000 19,462,000  
Unrealized gain on available-for-sale securities 7,796,000 5,911,000 0  
Losses associated with pensions, net of tax recoveries of $0.3 million (2011: $0.4 million) 12,731,000 17,809,000 15,486,000  
Accumulated other comprehensive loss (6,757,000) (18,730,000) (34,948,000) (33,311,000)
Tax recoveries from losses associated with pensions (200,000) (300,000)    
Number of reportable segments 2      
Other operating gains and losses | Energy trading contract
        
Trading activity:        
Gains and losses on trading activity 0 0 2,000,000  
Assets Held under Capital Leases [Member]
        
Trading activity:        
Drydocking expenditure 0      
Depreciation 0 15,800,000 16,600,000  
Newbuildings
        
Trading activity:        
Interest Costs Capitalized $ 22,500,000 $ 10,300,000 $ 3,600,000  
Minimum [Member] | Drydocking [Member]
        
Trading activity:        
Property, Plant and Equipment, Useful Life 2 years