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Stock Options And Restricted Stock (Schedule Of Information Regarding Share-Based Payment Arrangements) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Options And Restricted Stock [Abstract]      
Proceeds from stock options exercised   $ 452 $ 6,027
Excess tax benefits (shortfall) related to share-based payment arrangements (569) 2,808 3,011
Intrinsic value of stock options exercised   $ 1,184 [1] $ 6,032 [1]
[1] Intrinsic value of stock options exercised is estimated by taking the difference between the Company's closing stock price on the date of exercise and the exercise price, multiplied by the number of options exercised for each option holder and then aggregated.