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
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments Designated As Cash Flow Hedges [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in other comprehensive income or loss $ (7,138) $ 5,582
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 1,434 2,257
Gain (loss) recognized in income or loss for amount excluded from effectiveness testing and for the ineffective portion 422 (122)
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 161 0
Gain (loss) recognized in income or loss for amount excluded from effectiveness testing and for the ineffective portion 4 (15)
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 $ (1,554) $ 2,936