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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments Designated As Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income or loss	$ (951)	$ (736)	$ 1,929	$ (143)
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	3,217	3,219	4,843	4,011
Gain (loss) recognized in income or loss for amount excluded from effectiveness testing and for the ineffective portion	8	(12)	(37)	(16)
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	0	441
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	137	0	6,149	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	$ 0	$ (881)	$ 0	$ (7,134)