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Stock-Based Compensation (Schedule of Non-Qualified Stock Options Activity) (Details) (Non Qualified Options, USD $)
 6 Months Ended
Jun. 30, 2012
Non Qualified Options
  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at beginning of year, Shares 112,800
Granted, Shares 0
Exercised, Shares (5,000)
Cancelled, Shares 0
Outstanding at June 30, 2012, Shares 107,800
Granted, Exercise Price $ 0.00 [1]
Exercised, Exercise Price $ 11.45 [1]
Cancelled, Exercise Price $ 0.00 [1]
Outstanding at June 30, 2012, Exercise Price $ 18.95 [1]
Exercisable at June 30, 2012, Shares 56,200
Exercisable at June 30, 2012, Exercise Price $ 19.43 [1]
Available for grant at June 30, 2012, Shares 320,500
[1] Weighted Averages