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v3.8.0.1

Stock-Based Compensation - Outperformance Plan (Details) - USD ($) | Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2016
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Outperformance Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum bonus pool | $ 20,000,000.0 | $ 20,000,000.0 | $ 17,500,000.0

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Maximum Share Value Authorized Under Plan + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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