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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings per share | 10. Earnings per Share The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average number of common shares outstanding used to compute basic earnings per share | 52,362 |  |  | 52,500 |  |  | 52,282 |  |  | 52,660 |
Dilutive effect of stock-based awards | 672 |  |  | 673 |  |  | 708 |  |  | 659 |
Number of shares used to compute diluted earnings per share | 53,034 |  |  | 53,173 |  |  | 52,990 |  |  | 53,319 |
The number of anti-dilutive share equivalents outstanding during the three and nine months ended September 30, 2018 and 2017 was insignificant.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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