Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plans (Schedule Of Other Information Pertaining To Option Activity) (Details)

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Stock Incentive Plans (Schedule Of Other Information Pertaining To Option Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Incentive Plans [Abstract]      
Weighted-average fair value of options granted $ 13.94 $ 11.60 $ 8.76
Total intrinsic value of stock options exercised $ 11,744 $ 1,999 $ 2,192