Equity-Based Compensation (Summary Of Outstanding Stock Options) (Details) (USD $) In Thousands, except Per Share data	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, (in shares)	222,130
Shares exercised, (in shares)	(65,382)
Shares canceled or expired, (in shares)	0
Outstanding and exercisable at September 30, (in shares)	156,748
Outstanding at January 1, Weighted Avg. Exercise Price (in dollars per share)	$ 21.64
Shares exercised, Weighted Avg. Exercise Price (in dollars per share)	$ 18.81
Shares canceled or expired, Weighted Avg. Exercise Price (in dollars per share)	$ 0
Outstanding and exercisable at September 30, Weighted Avg. Exercise Price (in dollars per share)	$ 22.82
Shares exercised, Aggregate Intrinsic Value	$ 1,316	$ 1,200
Outstanding and exercisable at September 30, Aggregate Intrinsic Value	$ 1,363