Share-Based Compensation Share-Based Compensation (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2013	1,540,000		1,550,000
Stock Options, Outstanding, Weighted Average Exercise Price	$ 42.61
Granted, Stock Options	0
Stock Options, Grants in Period, Weighted Average Exercise Price	$ 0.00
Exercised, Stock Options	0
Stock Options, Exercises in Period, Weighted Average Exercise Price	$ 0.00
Forfeited, Stock Options	12,000
Stock Options, Forfeitures in Period, Weighted Average Exercise Price	$ 42.61
Outstanding at March 31, 2013	1,528,000	[1],[2]	1,550,000
Stock Options, Outstanding, Weighted Average Exercise Price	$ 42.61	[1],[2]
Remaining Contractual Term (years)	8 years 10 months 12 days	[1],[2]

[1] As of March 31, 2013, 308,000 of the outstanding stock options were exercisable.

[2] The total intrinsic value of options outstanding at March 31, 2013 was $15.0 million.