Equity-Based Compensation (Summary Of Outstanding Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, (in shares)	144,684
Shares exercised, (in shares)	(40,830)
Shares canceled or expired, (in shares)	0
Outstanding and exercisable at September 30, (in shares)	103,854
Outstanding at January 1, Weighted Avg. Exercise Price (in dollars per share)	$ 23.34
Shares exercised, Weighted Avg. Exercise Price (in dollars per share)	$ 16.63
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)	$ 25.68
Shares exercised, Aggregate Intrinsic Value	$ 679	$ 1,300
Outstanding and exercisable at September 30, Aggregate Intrinsic Value	$ 1,214