Stock-Based Compensation (Schedule of Options Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Outstanding Number of Options	5,829,945
Range of Exercise Price Per Share Minimum Range	$ 5.51
Range of Exercise Price Per Share Maximum Range	$ 71.50
Weighted Average Exercise Price Per Share	$ 44.09
Outstanding Options	6 years 4 months 29 days
Options Exercisable	3,170,504
Weighted Average Exercise Price Per Share	$ 37.07
Range One [Member]
Outstanding Number of Options	703,811
Range of Exercise Price Per Share Minimum Range	$ 5.51
Range of Exercise Price Per Share Maximum Range	$ 28.39
Weighted Average Exercise Price Per Share	$ 26.32
Outstanding Options	5 years 5 months 16 days
Options Exercisable	458,581
Weighted Average Exercise Price Per Share	$ 25.22
Range Two [Member]
Outstanding Number of Options	733,695
Range of Exercise Price Per Share Minimum Range	$ 31.06
Range of Exercise Price Per Share Maximum Range	$ 31.54
Weighted Average Exercise Price Per Share	$ 31.49
Outstanding Options	3 years 6 months 4 days
Options Exercisable	691,370
Weighted Average Exercise Price Per Share	$ 31.50
Range Three [Member]
Outstanding Number of Options	972,017
Range of Exercise Price Per Share Minimum Range	$ 32.21
Range of Exercise Price Per Share Maximum Range	$ 37.70
Weighted Average Exercise Price Per Share	$ 37.52
Outstanding Options	4 years 6 months 0 days
Options Exercisable	970,173
Weighted Average Exercise Price Per Share	$ 37.53
Range Four [Member]
Outstanding Number of Options	1,237,938
Range of Exercise Price Per Share Minimum Range	$ 38.06
Range of Exercise Price Per Share Maximum Range	$ 47.25
Weighted Average Exercise Price Per Share	$ 43.41
Outstanding Options	6 years 0 months 2 days
Options Exercisable	823,641
Weighted Average Exercise Price Per Share	$ 43.56
Range Five [Member]
Outstanding Number of Options	966,548
Range of Exercise Price Per Share Minimum Range	$ 50.78
Range of Exercise Price Per Share Maximum Range	$ 58.60
Weighted Average Exercise Price Per Share	$ 51.25
Outstanding Options	8 years 2 months 22 days
Options Exercisable	198,019
Weighted Average Exercise Price Per Share	$ 51.14
Range Six [Member]
Outstanding Number of Options	1,215,936
Range of Exercise Price Per Share Minimum Range	$ 62.00
Range of Exercise Price Per Share Maximum Range	$ 71.50
Weighted Average Exercise Price Per Share	$ 62.22
Outstanding Options	9 years 2 months 6 days
Options Exercisable	28,720
Weighted Average Exercise Price Per Share	$ 62.00