Share-Based Compensation (Summary Of Restricted Stock Activity And Restricted Stock Unit Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock Units [Member]	Jun. 30, 2012 Restricted Stock Units [Member]	Jun. 30, 2012 Cash-Settled Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Beginning Balance					281		69	149
Shares, Granted				99			79	137
Shares, Vested				(128)			(24)	(38)
Shares, Forfeited				(10)				(14)
Shares, Forfeited	(28)	0
Shares, Ending Balance				242	281	124	124	234
Shares, Vested awards not issued							193
Shares, Total restricted stock unit						317
Weighted Average Grant Price, Beginning Balance (in $/share)					$ 24.28		$ 36.47	$ 32.97
Weighted Average Grant Price, Granted (in $/share)				$ 32.89			$ 32.97	$ 33.37
Weighted Average Grant Price, Vested (in $/share)				$ 21.90			$ 36.16	$ 32.55
Weighted Average Grant Price, Forfeited (in $/share)				$ 32.00				$ 32.04
Weighted Average Exercise Price, Forfeited (in $/share)	$ 29.80	$ 29.80	$ 0.00
Weighted Average Grant Price, Ending Balance (in $/share)				$ 28.73	$ 24.28	$ 34.30	$ 34.30	$ 33.33
Weighted Average Grant Price, Vested awards not issued (in $/share)							$ 24.05
Weighted Average Grant Price, Total restricted stock unit (in $/share)							$ 28.07
Aggregate Intrinsic Value, Non-vested Ending Balance				$ 8,736		$ 4,496	$ 4,496	$ 8,471
Aggregate Intrinsic Value, Vested awards not issued						6,950	6,950
Aggregate Intrinsic Value, Total restricted stock unit						$ 11,446	$ 11,446