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Stock Incentive Plans (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Summary of information about stock options outstanding  
Option Outstanding, Number of shares 538,697
Option outstanding, Weighted-average exercise price $ 14.66
Options exercisable, Exercisable at December 31, 2012 241,772
Options exercisable, Weighted-average exercise price $ 13.60
Range One [Member]
  
Summary of information about stock options outstanding  
Option outstanding, Exercise Price Range, Lower Range Limit $ 2.01
Option outstanding, Exercise Price Range, Upper Range Limit $ 2.58
Option Outstanding, Number of shares 3,250
Option outstanding, Weighted-average exercise price $ 2.21
Option outstanding, Weighted-average remaining contractual life (year) 3 months 18 days
Options exercisable, Exercisable at December 31, 2012 3,250
Options exercisable, Weighted-average exercise price $ 2.21
Range Two [Member]
  
Summary of information about stock options outstanding  
Option outstanding, Exercise Price Range, Lower Range Limit $ 8.82
Option outstanding, Exercise Price Range, Upper Range Limit $ 17.55
Option Outstanding, Number of shares 535,447
Option outstanding, Weighted-average exercise price $ 14.74
Option outstanding, Weighted-average remaining contractual life (year) 6 years 7 months 6 days
Options exercisable, Exercisable at December 31, 2012 238,522
Options exercisable, Weighted-average exercise price $ 13.75