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FINANCIAL INSTRUMENTS - Fair Values (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Fair values:        
Cash and cash equivalents, carrying value $ 66,913,000 $ 164,717,000 $ 122,231,000 $ 56,114,000
Long-term debt - fixed 0 [1] 10,000,000 [1]    
Long-term debt - floating 771,549,000 [1] 787,078,000 [1]    
Obligations under capital leases 405,843,000 [1] 411,875,000 [1]    
Level 1
        
Fair values:        
Cash and cash equivalents, carrying value 66,913,000 164,717,000    
Cash and cash equivalents, fair value 66,913,000 164,717,000    
Restricted cash and short-term investments 213,282,000 207,856,000    
Level 3
        
Fair values:        
Long-term unlisted investments 7,347,000 [1] 7,347,000 [1]    
Level 2 | Commodity contract
        
Fair values:        
Hedge assets 0 111,000    
Level 2 | Interest rate swap
        
Fair values:        
Interest rate cash flow hedge liability 59,084,000 [2] 50,051,000 [2]    
Level 2 | Interest rate swap | Cash flow hedging
        
Fair values:        
Fair value/carrying value of derivatives 25,900,000 24,000,000    
Notional value 436,300,000 284,300,000    
Level 2 | Currency swap
        
Fair values:        
Foreign currency derivative liability $ 27,622,000 $ 26,205,000    
[1] The fair value hierachy is only applicable to each financial instrument on the consolidated balance sheets that are recorded at fair value on a recurring basis.
[2] The fair value/carrying value of interest rate swap agreements that qualify and are designated as a cash flow hedge as at December 31, 2011 and 2010, was $25.9 million (with a notional value of $436.3 million) and $24 million (with a notional value of $284.3 million), respectively. The expected maturity of these interest rate agreements is from April 2012 to March 2018.