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Stock-Based Compensation (Details 3) (Stock options, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 0.00      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 50.00      
Number of stock options outstanding (in shares) 14,058,574 16,399,870 21,336,159 21,918,500
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 1 month 13 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 21.71 $ 19.04 $ 20.53 $ 18.62
Number of stock options exercisable 4,799,173 6,011,719 8,389,683  
Options Exercisable, Weighted-Average Remaining Contractual Life 4 years 1 month 24 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 17.14 $ 18.31 $ 21.70  
Range of Exercise Prices $00.00 - $10.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 0.00      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 10.00      
Number of stock options outstanding (in shares) 1,914,198      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 9 months 25 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 6.29      
Number of stock options exercisable 1,810,798      
Options Exercisable, Weighted-Average Remaining Contractual Life 3 years 8 months 26 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 6.29      
Range of Exercise Prices $10.01 - $15.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 10.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 15.00      
Number of stock options outstanding (in shares) 140,286      
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 6 months      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 12.20      
Number of stock options exercisable 23,085      
Options Exercisable, Weighted-Average Remaining Contractual Life 5 years 3 months 11 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 12.75      
Range of Exercise Prices $15.01 - $20.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 15.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 20.00      
Number of stock options outstanding (in shares) 5,406,475      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 4 months 28 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 17.92      
Number of stock options exercisable 615,875      
Options Exercisable, Weighted-Average Remaining Contractual Life 2 years 10 months 24 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 17.81      
Range of Exercise Prices $20.01 - $25.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 20.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 25.00      
Number of stock options outstanding (in shares) 1,646,312      
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 11 months 5 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 21.43      
Number of stock options exercisable 978,212      
Options Exercisable, Weighted-Average Remaining Contractual Life 2 years 6 months 11 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 21.28      
Range of Exercise Prices $25.01 - $30.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 25.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 30.00      
Number of stock options outstanding (in shares) 2,258,007      
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years 1 month 2 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 27.80      
Number of stock options exercisable 1,205,907      
Options Exercisable, Weighted-Average Remaining Contractual Life 6 years 7 months 17 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 27.71      
Range of Exercise Prices $30.01 - $35.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 30.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 35.00      
Number of stock options outstanding (in shares) 504,796      
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 5 months 23 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 31.95      
Number of stock options exercisable 148,296      
Options Exercisable, Weighted-Average Remaining Contractual Life 4 years 5 months 19 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 31.62      
Range of Exercise Prices $35.01 - $40.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 35.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 40.00      
Number of stock options outstanding (in shares) 2,159,500      
Options Outstanding, Weighted-Average Remaining Contractual Life 9 years 11 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 36.64      
Number of stock options exercisable 7,000      
Options Exercisable, Weighted-Average Remaining Contractual Life 9 years 4 days      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 36.40      
Range of Exercise Prices $40.01 - $45.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 40.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 45.00      
Number of stock options outstanding (in shares) 10,000      
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 6 months      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 42.52      
Number of stock options exercisable 10,000      
Options Exercisable, Weighted-Average Remaining Contractual Life 4 years 6 months      
Options Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 42.52      
Range of Exercise Prices $45.01 - $50.00
        
Exercise prices for stock options outstanding and exercisable        
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) $ 45.01      
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) $ 50.00      
Number of stock options outstanding (in shares) 19,000      
Options Outstanding, Weighted-Average Remaining Contractual Life 9 years 4 months 10 days      
Options Outstanding, Weighted-Average Exercise Price (in dollars per share) $ 45.68