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Stock Incentive Plans and Stock-Based Compensation (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Summary of stock option activity  
Outstanding, Number of Options at December 31, 2011 671,294
Outstanding, Exercise Price at December 31, 2011 $ 14.48
Options granted, Number of Options 7,500
Options granted, Weighted Average Exercise Price $ 17.55
Options exercised, Number of Options (127,797)
Options exercised, Weighted Average Exercise Price $ 14.11
Options cancelled or expired, Number of Options (7,500)
Options cancelled or expired, Weighted Average Exercise Price $ 13.76
Outstanding, Number of Options at September 30, 2012 543,497
Outstanding, Exercise Price at September 30, 2012 $ 14.62
Exercisable, Number of Options at September 30, 2012 245,972
Exercisable, Exercise Price at September 30, 2012 $ 13.53
Available for grant at September 30, 2012