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) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Derivatives Designated As Hedging Instruments [Member] | Currency Forward Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross notional amount of outstanding derivative instruments designated as cash flow hedges $ 144,000 $ 86,260
Derivatives Designated As Hedging Instruments [Member] | Currency Option Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross notional amount of outstanding derivative instruments designated as cash flow hedges   4,500
Derivatives Not Designated As Hedging Instrument [Member] | Currency Forward Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross notional amount of outstanding derivative instruments not designated as cash flow hedges $ 138,807 $ 179,382