Equity-Based Compensation (Summary Of Outstanding Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, (in shares)		83,827
Shares exercised, (in shares)	(65,461)
Shares canceled or expired, (in shares)	0
Outstanding and exercisable at June 30, (in shares)	18,366	83,827
Outstanding at January 1, Weighted Avg. Exercise Price (in dollars per share)		$ 27.46
Shares exercised, Weighted Avg. Exercise Price (in dollars per share)	$ 27.47
Shares canceled or expired, Weighted Avg. Exercise Price (in dollars per share)	$ 0
Outstanding and exercisable at June 30, Weighted Avg. Exercise Price (in dollars per share)	$ 27.42	$ 27.46
Shares exercised, Aggregate Intrinsic Value	$ 1,312
Outstanding and exercisable at June 30, Aggregate Intrinsic Value	$ 239