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Summary of Significant Accounting Policies Stock-Based Compensation (Details) | 12 Months Ended
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Dec. 31, 2016
Employee Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date | 5.00%

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- Definition Discount rate from fair 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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- 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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