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Stock-Based Compensation (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2013 plans
Share-based Compensation [Abstract] |
Number of equity-based compensation plans | 1
Number of opportunities to purchase common stock at discount, per year | 2
Employee stock plan purchase discount | 15.00%

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- Definition Share-based Compensation, Common Stock Purchase Terms, Per Year + References No definition available. + Details
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- Definition Share-based Compensation, Equity-based Compensation Plan, Number + References No definition available. + Details
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- Details
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- Definition The discount rate from market value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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