Financial Instruments and Risk Management Financial Instruments and Risk Management (Effect and Classification of Derivative Instuments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) recognized in other comprehensive income, net of tax	$ 2,779	$ 753	$ 3,489
Designated as Hedging Instrument [Member] | Cost of Sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) reclassified from accumulated other comprehensive income to income for the effective portion	5,721	5,908	(6,862)
Gain reclassified from accumulated other comprehensive income to income as a result of cash flow hedge discontinuance	0	441	0
Loss recognized in income for amount excluded from effectiveness testing and for the ineffective portion	(71)	(40)	(1,889)
Not Designated as Hedging Instrument [Member] | Other Non-Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) recognized in income	8,824	0	0
Not Designated as Hedging Instrument [Member] | Selling, General and Administrative Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) recognized in income	$ 0	$ (1,841)	$ 1,216