Employee Stock-Based Compensation and Benefit Plans (Schedule of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation [Abstract]
Options outstanding at December 31, 2010	10,699,905
Granted	398,634
Assumed	11,860
Exercised	(3,136,511)
Forfeited or expired	(384,356)
Options outstanding at December 31, 2011	7,589,532	10,699,905
Vested or expected to vest	7,392,833
Options exercisable at December 31, 2011	4,835,085
Weighted-average exercise price, options outstanding at December 31, 2010	$ 48.06
Weighted-average exercise price, options granted	$ 69.91
Weighted-average exercise price, options granted, options assumed	$ 6.87
Weighted-average exercise price, options exercised	$ 34.56
Weighted-average exercise price, options forfeited or expired	$ 59.46
Weighted-average exercise price, options outstanding at December 31, 2011	$ 54.15	$ 48.06
Weighted-average exercise price, options vested or expected to vest	$ 53.92
Weighted-average exercise price, options exercisable at December 31, 2011	$ 49.52
Weighted-average remaining contractual life, beginning of period (in years)	2 years 8 months 12 days	3 years 2 months 27 days
Weighted-average remaining contractual life, end of period (in years)	2 years 8 months 12 days	3 years 2 months 27 days
Weighted-average remaining contractual life, vested or expected to vest (in years)	2 years 8 months 5 days
Weighted-average remaining contractual life, exercisable at December 31, 2011 (in years)	2 years 3 months 4 days
Aggregate intrinsic value, options outstanding	$ 120,299
Aggregate intrinsic value, options vested or expected to vest	118,535
Aggregate intrinsic value, options exercisable at December 31, 2011	$ 94,374