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
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Derivative Instruments Designated As Cash Flow Hedges [Member]
     
Derivative instruments designated as cash flow hedges:      
Gross notional amount of outstanding derivative instruments designated as cash flow hedges $ 84,500 $ 70,000 $ 97,925
Derivative Instruments Not Designated As Cash Flow Hedges [Member]
     
Derivative instruments not designated as cash flow hedges:      
Gross notional amount of outstanding derivative instruments not designated as cash flow hedges $ 65,900 $ 121,934 $ 89,462