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Employee Benefits and Share-Based Compensation - Stock Purchase Plan (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares reserved for future issuance (in shares) | 7,835
1997 Employee Stock Purchase Plan | Employee Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Maximum percentage of earnings allowed for purchase of shares | 15.00%
Maximum fair market value of shares | $ | $ 25,000
Purchase price of common stock, percent | 85.00%
Shares reserved for future issuance (in shares) | 2,365

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + 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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