Stock-Based Compensation (Schedule Of Share-Based Payment Arrangements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost charged against income, before income tax benefit	$ 516	$ 497	$ 1,138	$ 967
Stock-Based Compensation Cost Included In:
Cost of revenues	35	34	72	62
Operating expenses	481	463	1,066	905
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost charged against income, before income tax benefit	335	366	758	734
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost charged against income, before income tax benefit	$ 181	$ 131	$ 380	$ 233