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 $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Stock-Based Compensation [Abstract]    
Options, Outstanding 311,153  
Options, Awarded 160,302  
Options, Outstanding 471,455 311,153
Options, Exercisable at March 31, 2013 214,496  
Options, Expected to vest March 31, 2013 465,701  
Weighted average exercise price per share, Outstanding $ 12.05  
Weighted average exercise price per share, Awarded $ 10.10  
Weighted average exercise price per share, Outstanding $ 11.39 $ 12.05
Weighted average exercise price per share, Exercisable at March 31, 2013 $ 11.43  
Weighted average exercise price per share, Expected to vest March 31, 2013 $ 11.38  
Options, Outstanding - Weighted average remaining contractual term 5 years 6 months 4 years 11 months 23 days
Options, Exercisable at March 31, 2013 - Weighted average remaining contractual term 4 years 3 months 29 days  
Options, Expected to vest March 31, 2013 - Weighted average remaining contractual term 5 years 5 months 27 days