Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments And Risk Management (Gross Notional Amount Of Outstanding Derivative Instruments) (Details)

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Financial Instruments And Risk Management (Gross Notional Amount Of Outstanding Derivative Instruments) (Details) (Currency Forward Contracts [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Derivative Instruments Designated As Cash Flow Hedges [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Gross notional amount of outstanding derivative instruments designated as cash flow hedges $ 118,525 $ 144,000 $ 148,085
Derivative Instruments Not Designated As Cash Flow Hedges [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Gross notional amount of outstanding derivative instruments not designated as cash flow hedges $ 104,605 $ 138,807 $ 158,797