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Common Stock Plans (Stock Incentive Plan) (Details) (Stock Incentive Plan)
Dec. 31, 2011
Apr. 27, 2011
Stock Incentive Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Increase in number of shares authroized for issuance   3,000,000
Number of shares authroized for issuance   8,600,000
Number of shares remaining for issuance 3,798,701