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Stockholders' Equity And Benefit Plans (Schedule Of Stock Options And Stock Appreciation Rights Outstanding And Exercisable) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Y
Dec. 31, 2011
Y
Mar. 31, 2012
Range Of Exercise Prices $11.66 - $13.15 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $13.15 - $26.29 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $26.29 - $39.44 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $39.44 - $52.58 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $65.73 - $78.88 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $78.88 - $92.02 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $92.02 - $105.17 [Member]
Y
Mar. 31, 2012
Range Of Exercise Prices $118.31 - $131.46 [Member]
Y
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Line Items]                    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 1,193 1,220 21 325 311 32 5 202 5 292
Stock Options and Stock Appreciation Rights Outstanding, Weighted-Average Exercise Price $ 61.03 $ 41.20 $ 11.71 $ 18.79 $ 34.47 $ 43.12 $ 69.53 $ 81.23 $ 93.29 $ 127.19
Stock Options and Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (Years) 6.6 5.8 0.9 4.5 6.0 5.7 7.9 8.5 9.0 8.5
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 515   21 234 147 32 2 47 0 32
Stock Options and Stock Appreciation Rights Exercisable, Weighted-Average Exercise Price $ 37.46   $ 11.71 $ 20.68 $ 34.08 $ 43.12 $ 69.53 $ 81.23 $ 0.00 $ 121.73
Stock Options and Stock Appreciation Rights Outstanding, lower range     $ 11.66 $ 13.15 $ 26.29 $ 39.44 $ 65.73 $ 78.88 $ 92.02 $ 118.31
Stock Options and Stock Appreciation Rights Outstanding, upper range     $ 13.15 $ 26.29 $ 39.44 $ 52.58 $ 78.88 $ 92.02 $ 105.17 $ 131.46