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Stock-Based Compensation (Details)	Dec. 31, 2013
2008 Equity and Incentive Plan \| Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	12,000,000
2008 Equity and Incentive Plan \| Grant Awards, Other than Options, or Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,000,000
2007 Non-Employee Director Plan [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,000,000.0

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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