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Earnings Per Share Options to Purchase Shares Excluded from Diluted Earnings Per Share and Range of Exercise Prices (Details) (Stock Options [Member], USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options to Purchase Common Shares Outstanding, Excluded from Earnings Per Share Assuming Dilution, Exercise Price Greater Than Average Stock Price 1,498,100 2,296,600 1,502,100 2,296,600
Minimum [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock Options, Excluded from Diluted Earnings per Share, Range of Exercise Prices 11.88 10.65 11.35 10.65
Maximum [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock Options, Excluded from Diluted Earnings per Share, Range of Exercise Prices 14.34 14.34 14.34 14.34