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Stock-Based Compensation (Schedule of Non-Qualified Stock Options Outstanding and Excercisable) (Details) (Non Qualified Options, USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Non Qualified Stock Options Exercise Price Range $11.45- $12.10
Jun. 30, 2012
Non-Qualified Stock Options Exercise Price Range $13.96- $19.79
Jun. 30, 2012
Non- Qualified Stock Options Exercise Price Range $25.02- $26.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of Excercise Price, Lower Range Limit     $ 11.45 $ 13.96 $ 25.02
Range of Exercise Price, Upper Range Limit     $ 12.10 $ 19.79 $ 26.45
Options Outstanding, Shares     49,300 6,000 52,500
Options Outstanding, Shares, Total 107,800 112,800      
Options Outstanding, Remaining Contractual Life (yrs)     7 years [1] 3 years [1] 7 years 2 months 27 days [1]
Options Outstanding, Exercise Price     $ 11.45 [1] $ 19.79 [1] $ 25.90 [1]
Options Exercisable, Shares     21,700 6,000 28,500
Options Exercisable, Shares, Total 56,200        
Options Exercisable, Exercise Price     $ 11.45 [1] $ 19.79 [1] $ 25.43 [1]
[1] Weighted Averages