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Share-based Payment Arrangements (Amounts Recognized In The Financial Statements With Respect To Plans) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 26, 2011
Share-based Payment Arrangements [Abstract]    
Total cost of the Plans during the period $ 1,525 $ 1,205
Amount of related income tax benefit recognized during the period 953 305
Net cost of the Plans during the period $ 572 $ 900