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Stockholders' Equity And Benefit Plans (Schedule Of Stock Option And Stock Appreciation Rights Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Stockholders' Equity And Benefit Plans [Abstract]  
Outstanding at December 31, 2011, Shares 1,220
Outstanding at December 31, 2011, Weighted-Average Exercise Price $ 41.20
Outstanding at December 31, 2011, Weighted-Average Contractual Term (Years) 5.8
Outstanding at December 31, 2011, Aggregate Intrinsic Value $ 49,125
Granted, Shares 246
Granted, Weighted-Average Exercise Price $ 127.84
Exercised, Shares (263)
Exercised, Weighted-Average Exercise Price $ 31.95
Exercised, Aggregate Intrinsic Value 24,613
Forfeited or expired, Shares (10)
Forfeited or expired, Weighted-Average Exercise Price $ 54.52
Outstanding at March 31, 2012, Shares 1,193
Outstanding at March 31, 2012, Weighted-Average Exercise Price $ 61.03
Outstanding at March 31, 2012, Weighted-Average Contractual Term (Years) 6.6
Outstanding at March 31, 2012, Aggregate Intrinsic Value 84,641
Exercisable at March 31, 2012, Shares 515
Exercisable at March 31, 2012, Weighted-Average Exercise Price $ 37.46
Exercisable at March 31, 2012, Weighted-Average Contractual Term (Years) 4.7
Exercisable at March 31, 2012, Aggregate Intrinsic Value 48,661
Nonvested at March 31, 2012, Shares 678
Nonvested at March 31, 2012, Weighted-Average Exercise Price $ 78.92
Nonvested at March 31, 2012, Weighted-Average Contractual Term (Years) 8.0
Nonvested at March 31, 2012, Aggregate Intrinsic Value 35,980
Expected to vest, Shares 612
Expected to vest, Weighted-Average Exercise Price $ 78.92
Expected to vest, Weighted-Average Contractual Term (Years) 8.0
Expected to vest, Aggregate Intrinsic Value $ 32,655