Stock-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Long-Term Performance Based Plans
Stock option activity
Total options outstanding at the end of the period (in shares)	9,790,850
Weighted-Average Exercise Price
Total options outstanding at the end of the period (in dollars per share)	$ 21.58
Stock options
Stock option activity
Total options outstanding at the beginning of the period (in shares)	16,399,870
Granted (in shares)	1,875,000
Exercised (in shares)	(517,288)
Forfeited and cancelled (in shares)	(32,000)
Total options outstanding at the end of the period (in shares)	17,725,582
Exercisable at the end of the period (in shares)	5,976,931
Weighted-Average Exercise Price
Total options outstanding, beginning of the period (in dollars per share)	$ 19.04
Granted (in dollars per share)	$ 36.40
Exercised (in dollars per share)	$ 19.10
Forfeited and cancelled (in dollars per share)	$ 18.99
Total options outstanding at the end of the period (in dollars per share)	$ 20.17
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 17.63
Share-based compensation additional disclosures
Tax benefit from stock awards exercised	$ 1,822	$ 1,743
Aggregate intrinsic value
Aggregate intrinsic value of stock options outstanding	314,359
Aggregate intrinsic value of stock options exercisable	$ 121,145