Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments And Risk Management (Effect And Classification Of Derivative Instruments) (Details)

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Financial Instruments And Risk Management (Effect And Classification Of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivative Instruments Designated As Cash Flow Hedges [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income or loss $ (736) $ 7,973 $ (143) $ 2,379
Cost Of Sales [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) reclassified from accumulated other comprehensive income or loss to income or loss for the effective portion 3,219 (4,568) 4,011 (5,436)
Loss recognized in income or loss for amount excluded from effectiveness testing and for the ineffective portion (12) (940) (16) (1,586)
Cost Of Sales [Member] | No Longer Designated As Hedging Instrument [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain reclassified from accumulated other comprehensive income or loss as a result of cash flow hedge discontinuance 0 0 441 0
Selling, General And Administrative Expense [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income or loss $ (881) $ (1,541) $ (7,134) $ 3,218