Share-Based Compensation Plans (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Information about options in various price ranges
Outstanding Shares	3,148
Weighted Average Remaining Contractual Term	3 years 7 months 2 days
Weighted Average Exercise Price	$ 46.36
Options Exercisable, shares	2,032
Options Exercisable, weighted average exercise price	$ 45.76
Less than $45.00 [Member]
Information about options in various price ranges
Lower limit price range	$ 0.00
Upper limit price range	$ 45.00
Outstanding Shares	1,131
Weighted Average Remaining Contractual Term	3 years 4 months 24 days
Weighted Average Exercise Price	$ 33.82
Options Exercisable, shares	881
Options Exercisable, weighted average exercise price	$ 34.05
45.00-50.00 [Member]
Information about options in various price ranges
Lower limit price range	$ 45.00
Upper limit price range	$ 50.00
Outstanding Shares	617
Weighted Average Remaining Contractual Term	5 years 1 month 6 days
Weighted Average Exercise Price	$ 49.38
Options Exercisable, shares	204
Options Exercisable, weighted average exercise price	$ 49.38
50.00-55.00 [Member]
Information about options in various price ranges
Lower limit price range	$ 50.00
Upper limit price range	$ 55.00
Outstanding Shares	897
Weighted Average Remaining Contractual Term	3 years 7 months 6 days
Weighted Average Exercise Price	$ 53.04
Options Exercisable, shares	452
Options Exercisable, weighted average exercise price	$ 52.48
55.00 and over [Member]
Information about options in various price ranges
55.00 and over	55 and over
Outstanding Shares	503
Weighted Average Remaining Contractual Term	2 years 2 months 12 days
Weighted Average Exercise Price	$ 58.96
Options Exercisable, shares	495
Options Exercisable, weighted average exercise price	$ 58.96