Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk Management (Gross Notional Amount of Outstanding Derivatives) (Details)

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Financial Instruments and Risk Management (Gross Notional Amount of Outstanding Derivatives) (Details) (Forward Contracts [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Forward Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Currency forward contracts designated as cash flow hedges $ 70,000 $ 144,000
Currency forward contracts not designated as cash flow hedges $ 121,934 $ 138,807