Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk Management Financial Instruments and Risk Management (Effect and Classification of Derivative Instuments) (Details)

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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