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General (Details 9) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based compensation        
Stock compensation expense $ 9,550,000 $ 4,602,000 $ 14,022,000 $ 10,240,000
Estimated forfeitures (as a percent)     4.00% 4.00%
Benefits of tax deductions in excess of recognized stock compensation expenses     2,400,000 500,000
Change to additional paid in capital related to tax net benefits (deficiencies)     2,100,000 (100,000)
Benefit of tax deductions in recognized stock compensation expenses     2,400,000 500,000
Deficiency of tax deductions in recognized stock compensation expenses     $ (300,000) $ (600,000)
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)     $ 13.61  
Expected volatility (as a percent)     26.20%  
Stock option activity        
Outstanding, beginning of period (in shares)     4,010,146  
Granted (in shares)     654,636  
Forfeited (in shares)     (137,472)  
Exercised (in shares)     (813,867)  
Outstanding, end of period (in shares) 3,713,443   3,713,443  
Vested and expected to vest end of period (in shares) 3,670,859   3,670,859  
Exercisable, end of period (in shares) 2,037,633   2,037,633  
Weighted average exercise price of stock options        
Outstanding, beginning of period (in dollars per share)     $ 47.23  
Granted (in dollars per share)     $ 60.22  
Forfeited (in dollars per share)     $ 52.91  
Exercised (in dollars per share)     $ 44.54  
Outstanding, end of period (in dollars per share) $ 49.90   $ 49.90  
Vested and expected to vest end of period (in dollars per share) $ 49.83   $ 49.83  
Exercisable, end of period (in dollars per share) $ 46.00   $ 46.00  
Vesting period     3 years  
Life of options (Expiration period)     10 years  
Nonvested restricted stock awards
       
Nonvested restricted stock awards and units        
Outstanding, beginning of period (in shares)     192,165  
Awarded (in shares)     1,448,674  
Vested (in shares)     (16,569)  
Outstanding, ending of period (in shares) 1,624,270   1,624,270  
Weighted average exercise price of nonvested restricted stock award and units        
Outstanding, beginning of period (in dollars per share)     $ 56.59  
Awarded (in dollars per share)     $ 57.74  
Vested (in dollars per share)     $ 52.82  
Outstanding, ending of period (in dollars per share) $ 57.65   $ 57.65  
Nonvested restricted stock awards | CDMI
       
Nonvested restricted stock awards and units        
Awarded (in shares)     1,433,946  
Nonvested restricted stock units
       
Weighted average exercise price of stock options        
Vesting period     3 years  
Nonvested restricted stock awards and units        
Outstanding, beginning of period (in shares)     194,913  
Awarded (in shares)     76,306  
Vested (in shares)     (90,177)  
Forfeited (in shares)     (11,293)  
Outstanding, ending of period (in shares) 169,749   169,749  
Weighted average exercise price of nonvested restricted stock award and units        
Outstanding, beginning of period (in dollars per share)     $ 50.21  
Awarded (in dollars per share)     $ 60.39  
Vested (in dollars per share)     $ 49.55  
Forfeited (in dollars per share)     $ 54.05  
Outstanding, ending of period (in dollars per share) $ 54.88   $ 54.88