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Earnings Per Share - Anti-dilutive Shares (Details) - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable (shares) | 154 | 304
On exercise of options where exercise price is greater than average market value for the period |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable (shares) | 154 | 223
On exercise of options and vesting of performance-based restricted stock units |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable (shares) | 0 | 78
On the settlement of employee stock purchase plan shares |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |
Net dilutive potential common shares issuable (shares) | 0 | 3

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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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