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Common Stock Plans (Stock Incentive Plan) (Details) (Stock Incentive Plan)	Dec. 31, 2012	Apr. 27, 2011
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance		8,600,000
Number of shares remaining for issuance	3,418,881

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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