Share-Based Compensation Share-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Number of Options, Beginning of Year	5,000
Granted (in shares)	1,550,000
Exercised (in shares)	(5,000)
Forfeited (in shares)	(10,000)
Outstanding, Number of Options, End of Year	1,540,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, Exercise Price, Beginning of Year (in dollars per share)	$ 25.77
Granted, Exercise Price (in dollars per share)	$ 42.61
Exercised, Exercise Price (in dollars per share)	$ 25.77
Forfeited, Exercise Price (in dollars per share)	$ 42.61
Outstanding, Exercise Price, End of Year (in dollars per share)	$ 42.61
Remaining Contractual Term	9 years 2 months 12 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of options granted per share	$ 9.20
Expected share price volatility	33.00%
Risk-free interest rate	1.35%
Dividend yield	3.80%
Expected life	6 years 6 months