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Reconciliation of Earnings Per Share (Details) - Antidilutive Securities (Stock options)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock options
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share (in options or shares) 849,583 293,978 849,583 293,978