Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.8
Stock-Based Compensation Stock-Based Compensation (Summary of Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Options outstanding, beginning, number of shares 1,723,989 1,919,096 1,872,214  
Granted, number of shares 354,110 358,169 340,973  
Cancelled, number of shares (59,549) (172,465) (40,396)  
Exercised, number of shares (444,418) (380,811) (253,695)  
Options outstanding, ending, number of shares 1,574,132 1,723,989 1,919,096 1,872,214
Options outstanding, beginning, weighted average exercise price $ 47.64 $ 46.05 $ 42.84  
Granted, weighted average exercise price $ 54.66 $ 48.82 $ 61.38  
Cancelled, weighted average exercise price $ 53.33 $ 52.90 $ 43.68  
Exercised, weighted average exercise price $ 43.96 $ 38.34 $ 43.32  
Options outstanding, ending, weighted average exercise price $ 50.04 $ 47.64 $ 46.05 $ 42.84
Options outstanding, beginning, weighted average remaining contractual life, years 6 years 4 months 10 days 6 years 1 month 24 days 6 years 3 months 6 years 4 months
Options outstanding, ending, weighted average remaining contractual life, years 6 years 4 months 10 days 6 years 1 month 24 days 6 years 3 months 6 years 4 months
Options outstanding, beginning, aggregate intrinsic value $ 13,001 $ 9,141 $ 33,057  
Options outstanding, ending, aggregate intrinsic value 45,187 13,001 9,141 33,057
Options vested and expected to vest, number of shares 1,520,425      
Options vested and expected to vest, weighted average exercise price $ 49.90      
Options vested and expected to vest, weighted average remining contractual life, years 6 years 3 months 11 days      
Options vested and expected to vest, aggregate intrinsic value 43,859      
Options exercisable, number of shares 821,859      
Options exercisable, weighted average exercise price $ 47.15      
Options exercisable, weighted average remaining contractual life 4 years 7 months 28 days      
Options exercisable, aggregate intrinsic value $ 25,969