Share-Based Compensation Share Based Compensation (Summmary of Restricted Stock Unit Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Outstanding	1,522,038	822,753	146,165	0
Weighted Average Grant Price of Restricted Stock Units	$ 23.19	$ 19.04	$ 23.69	$ 0.00
Restricted Stock Units Granted	949,418	726,779		146,165
Weighted Average Grant Price of Restricted Stock Units Granted	$ 25.99	$ 18.29	$ 23.69
Restricted Stock Units Vested	(160,580)	(34,885)
Restricted Stock Units Forfeited	(89,553)	(15,306)
Weighted Average Grant Price of Restricted Stock Units Vested	$ 20.17	$ 22.46
Weighted Average Grant Price of Restricted Stock Forfeited	$ 20.13	$ 20.22