Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Summary of Stock Option Activity) (Details)

v2.4.0.6
Stock-Based Compensation (Summary of Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Options outstanding, beginning, number of shares 1,919,096 1,872,214 1,760,173  
Granted, number of shares 358,169 340,973 385,924  
Cancelled, number of shares (172,465) (40,396) (77,481)  
Exercised, number of shares (380,811) (253,695) (196,402)  
Options outstanding, ending, number of shares 1,723,989 1,919,096 1,872,214 1,760,173
Options outstanding, beginning, weighted average exercise price $ 46.05 $ 42.84 $ 42.08  
Granted, weighted average exercise price $ 48.82 $ 61.38 $ 44.11  
Cancelled, weighted average exercise price $ 52.90 $ 43.68 $ 46.04  
Exercised, weighted average exercise price $ 38.34 $ 43.32 $ 37.34  
Options outstanding, ending, weighted average exercise price $ 47.64 $ 46.05 $ 42.84 $ 42.08
Options outstanding, beginning, weighted average remaining contractual life, years 6 years 1 month 24 days 6 years 3 months 6 years 4 months 6 years 3 months
Options outstanding, ending, weighted average remaining contractual life, years 6 years 1 month 24 days 6 years 3 months 6 years 4 months 6 years 3 months
Options outstanding, beginning, aggregate intrinsic value $ 9,141 $ 33,057 $ 4,599  
Options outstanding, ending, aggregate intrinsic value 13,001 9,141 33,057 4,599
Options vested and expected to vest, number of shares 1,672,468      
Options vested and expected to vest, weighted average exercise price $ 47.51      
Options vested and expected to vest, weighted average remining contractual life, years 6 years 0 months 29 days      
Options vested and expected to vest, aggregate intrinsic value 12,808      
Options exercisable, number of shares 989,092      
Options exercisable, weighted average exercise price $ 46.09      
Options exercisable, weighted average remaining contractual life 4 years 7 months 17 days      
Options exercisable, aggregate intrinsic value $ 8,708