Share-Based Compensation (Summary Of ESPP Annual Offerings) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount expensed under ESPP	$ 3,080	[1]	$ 2,607	[1]	$ 2,538	[1]
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares purchased (in shares)	55		65		79
Per common share purchase Price (in dollars per share)	$ 24.11		$ 19.75		$ 15.04
Amount expensed under ESPP	375		562		641
Net proceeds from issuance	$ 1,326		$ 1,288		$ 1,192
Common shares date of issue	Jan. 07, 2015		Jan. 03, 2014		Jan. 04, 2013

[1] Stock-based compensation expense is recorded in the selling, general and administrative caption in our consolidated statements of comprehensive income.