Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allocated Share-based Compensation Expense	$ 2,538	[1]	$ 2,152	[1]	$ 1,332	[1]
ESPP [Member]
Allocated Share-based Compensation Expense	641		282		317
Stock Option [Member]
Allocated Share-based Compensation Expense	$ 1,897		$ 1,870		$ 1,015

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