Equity Incentive Plans (Schedule Of Tax Benefit (Short-Fall) From Equity Incentive Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity Incentive Plans [Abstract]
(Short-fall)/benefit of tax deductions in excess of grant-date fair value	$ (290)	$ (539)	$ (196)
Benefit of tax deductions on grant-date fair value	362	539	198
Total benefit of tax deductions	$ 72		$ 2