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
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments Designated As Cash Flow Hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income or loss $ (266) $ 789 $ (8,191) $ 5,629
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 (784) 8,878 821 12,825
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net 0 0 (81) 0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 143 84 1,105 (126)
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 (46) 187 115 187
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net (4) (3) 1 (20)
Other Non-operating Income (Expense) [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income or loss $ (444) $ 260 $ (3,885) $ 2,840