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General (Details 9) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based compensation        
Stock compensation expense $ 4,524,000 $ 4,468,000 $ 14,764,000 $ 13,935,000
Estimated forfeitures (as a percent) 4.00% 4.00% 4.00% 4.00%
Benefits of tax deductions in excess of recognized stock compensation expenses     1,100,000 900,000
Change to additional paid in capital related to tax net benefits (deficiencies)     400,000 600,000
Benefit of tax deductions in recognized stock compensation expenses     1,100,000 900,000
Deficiency of tax deductions in recognized stock compensation expenses     $ (700,000) $ (300,000)
Stock options
       
Stock options, nonvested restricted stock awards and nonvested restricted stock units        
Grants in period, weighted average grant date fair value (in dollars per share)     $ 12.10  
Expected volatility (as a percent)     27.86%  
Stock option activity        
Outstanding, beginning of period (in shares)     4,268,240  
Granted (in shares)     981,133  
Forfeited (in shares)     (101,476)  
Exercised (in shares)     (562,554)  
Outstanding, end of period (in shares) 4,585,343   4,585,343  
Vested and expected to vest end of period (in shares) 4,538,122   4,538,122  
Exercisable, end of period (in shares) 2,519,497   2,519,497  
Weighted average exercise price of stock options        
Outstanding, beginning of period (in dollars per share)     $ 44.35  
Granted (in dollars per share)     $ 52.65  
Forfeited (in dollars per share)     $ 49.02  
Exercised (in dollars per share)     $ 43.22  
Outstanding, end of period (in dollars per share) $ 46.16   $ 46.16  
Vested and expected to vest end of period (in dollars per share) $ 46.11   $ 46.11  
Exercisable, end of period (in dollars per share) $ 42.84   $ 42.84  
Life of options (Expiration period)     10 years  
Stock options | Individuals other than the CEO
       
Weighted average exercise price of stock options        
Vesting period     3 years  
Stock options | CEO
       
Weighted average exercise price of stock options        
Vesting period     4 years  
Percentage of awards vesting in 2014     16.70%  
Percentage of awards vesting in 2015     33.30%  
Percentage of awards vesting in 2016     33.30%  
Percentage of awards vesting in 2017     16.70%  
Nonvested restricted stock awards
       
Nonvested restricted stock awards and units        
Outstanding, beginning of period (in shares)     23,672  
Awarded (in shares)     16,569  
Vested (in shares)     (23,672)  
Outstanding, ending of period (in shares) 16,569   16,569  
Weighted average exercise price of nonvested restricted stock award and units        
Outstanding, beginning of period (in dollars per share)     $ 42.25  
Awarded (in dollars per share)     $ 52.82  
Vested (in dollars per share)     $ 42.25  
Outstanding, ending of period (in dollars per share) $ 52.82   $ 52.82  
Nonvested restricted stock units
       
Nonvested restricted stock awards and units        
Outstanding, beginning of period (in shares)     202,690  
Awarded (in shares)     98,580  
Vested (in shares)     (95,138)  
Forfeited (in shares)     (5,935)  
Outstanding, ending of period (in shares) 200,197   200,197  
Weighted average exercise price of nonvested restricted stock award and units        
Outstanding, beginning of period (in dollars per share)     $ 47.38  
Awarded (in dollars per share)     $ 52.62  
Vested (in dollars per share)     $ 46.72  
Forfeited (in dollars per share)     $ 49.39  
Outstanding, ending of period (in dollars per share) $ 50.21   $ 50.21  
Nonvested restricted stock units | Individuals other than the CEO
       
Weighted average exercise price of stock options        
Vesting period     3 years  
Nonvested restricted stock units | CEO
       
Weighted average exercise price of stock options        
Vesting period     4 years  
Percentage of awards vesting in 2014     16.70%  
Percentage of awards vesting in 2015     33.30%  
Percentage of awards vesting in 2016     33.30%  
Percentage of awards vesting in 2017     16.70%