Schedule of Summary of Stock Option Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Shares (in thousands)
Outstanding at January 1, 2013	6,223
Granted	515
Exercised	(2,127)
Expired	(153)
Outstanding at December 31, 2013	4,458
Exercisable at December 31, 2013	3,303
Vested or expected to vest December 31, 2013	4,416
Weighted Average Exercise Price (in dollars per share)
Outstanding at January 1, 2013	$ 26.30
Granted	$ 38.07
Exercised	$ 19.34
Expired	$ 36.82
Outstanding at December 31, 2013	$ 30.67
Exercisable at December 31, 2013	$ 29.56
Vested or expected to vest December 31, 2013	$ 30.53
Weighted Average Remaining Contractual Term & Aggregate Intrinsic Value
Outstanding at December 31, 2013	3 years 4 months 2 days
Exercisable at December 31, 2013	2 years 6 months 4 days
Vested or expected to vest December 31, 2013	3 years 3 months 18 days
Outstanding at December 31, 2013	$ 210,719
Exercisable at December 31, 2013	155,813
Vested or expected to vest December 31, 2013	$ 208,353

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