Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule Of Changes In Number Of Outstanding Stock Options Under Director Plan And Stock Plan) (Details)

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Stock-Based Compensation (Schedule Of Changes In Number Of Outstanding Stock Options Under Director Plan And Stock Plan) (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Stock-Based Compensation [Abstract]    
Options, Outstanding - December 31, 2011 236,820  
Options, Awarded 92,223  
Options, Exercised (12,000)  
Options, Canceled (5,890)  
Options, Outstanding - June 30, 2012 311,153 236,820
Options, Exercisable at June 30, 2012 162,550  
Options, Expected to vest at June 30, 2012 308,405  
Weighted average exercise price per share, Outstanding - December 31, 2011 $ 11.35  
Weighted average exercise price per share, Awarded $ 13.10  
Weighted average exercise price per share, Exercised $ 7.13  
Weighted average exercise price per share, Canceled $ 10.58  
Weighted average exercise price per share, Outstanding - June 30, 2012 $ 12.05 $ 11.35
Weighted average exercise price per share, Exercisable at June 30, 2012 $ 10.71  
Weighted average exercise price per share, Expected to vest at June 30, 2012 $ 12.04  
Options, Outstanding - Weighted average remaining contractual term 5 years 5 months 27 days 5 years 2 months 5 days
Options, Exercisable at June 30, 2012 - Weighted average remaining contractual term 4 years 9 months  
Options, Expected to vest at June 30, 2012 - Weighted average remaining contractual term 5 years 5 months 27 days