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FINANCIAL INSTRUMENTS - Interest Rate Risk Management (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Derivatives designated as hedging instruments location:      
Unrealized net loss on qualifying cash flow hedging instruments $ (19,462,000) $ (20,964,000)  
Designated as hedging instrument | Interest rate swap | Swap | Cash flow hedging
     
Mark-to-market swaps valuation:      
Notional value 899,080,000    
Notional principal amount of debt and capital lease obligations 899,100,000 620,300,000  
Derivatives designated as hedging instruments location:      
Amount of gain/(loss) recognized in OCI on derivative (effective portion) 1,024,000 (8,578,000) 11,615,000
Unrealized net loss on qualifying cash flow hedging instruments 19,500,000    
Designated as hedging instrument | Interest rate swap | Swap | Cash flow hedging | Minimum
     
Mark-to-market swaps valuation:      
Fixed interest rate 0.92%    
Designated as hedging instrument | Interest rate swap | Swap | Cash flow hedging | Maximum
     
Mark-to-market swaps valuation:      
Fixed interest rate 5.04%    
Other Financial Items, Net [Member] | Designated as hedging instrument | Interest rate swap | Swap | Cash flow hedging
     
Derivatives designated as hedging instruments location:      
Effective portion Gain/(loss) reclassified from Accumulated Other Comprehensive Loss 0 0 0
Ineffective Portion $ 632,000 $ 427,000 $ 552,000