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Earnings per share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings per share |
Schedule of basic and diluted net income per share | The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):
|  | Three Months Ended |
|  | March 31, |
|  | 2018 |  | 2017 |
Net income |  | $ | 20,359 |  | $ | 21,513 |
Less net income allocated to participating securities: |  |  |  |  |  |  |
Non-forfeitable dividends on participating securities |  |  | (88) |  |  | (97) |
Net income available to common stockholders |  |  | 20,271 |  |  | 21,416 |
Effect of dilutive securities: |  |  |  |  |  |  |
Participating securities |  |  | — | (1) |  | 97 |
Net income for diluted net income per share |  | $ | 20,271 |  | $ | 21,513 |
Shares for basic net income per share |  |  | 39,451 |  |  | 39,366 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options |  |  | 3 |  |  | 11 |
Performance-based stock units |  |  | — | (2) |  | 75 |
Participating securities |  |  | — | (1) |  | 160 |
Total effect of dilutive securities |  |  | 3 |  |  | 246 |
Shares for diluted net income per share |  |  | 39,454 |  |  | 39,612 |
Basic net income per share |  | $ | 0.51 |  | $ | 0.54 |
Diluted net income per share |  | $ | 0.51 |  | $ | 0.54 |
| (1) |  | For the three months ended March 31, 2018, the participating securities have been excluded from the computation of diluted net income per share as such inclusion would be anti-dilutive.
| (2) |  | At March 31, 2018, no performance-based stock units would be earned based on TSR targets.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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