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Income Per Share | 12 Months Ended
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Dec. 31, 2018
Income Per Share |
Income Per Share | 12. INCOME PER SHARE Basic net income per share is calculated by dividing net income by the weighted average shares outstanding during the period, without consideration for common stock equivalents. Diluted net income per share is calculated by adjusting weighted average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury stock method. Basic and diluted income per share were computed as follows, in thousands, except share and per share amounts:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Net income - basic and diluted |  | $ | 134,752 |  | $ | 158,133 |  | $ | 72,606
Weighted average number of common shares outstanding - basic |  |  | 34,921,318 |  |  | 35,897,641 |  |  | 37,585,777
Dilutive effect of common stock equivalents: |  |  |  |  |  |  |  |  |
RSAs with service-based conditions |  |  | 151,324 |  |  | 221,497 |  |  | 192,705
RSAs with market-based conditions |  |  | 238,313 |  |  | 185,069 |  |  | 28,307
RSAs with performance-based conditions |  |  | 20,432 |  |  | — |  |  | —
Stock options |  |  | 281,932 |  |  | 267,939 |  |  | 60,423
Weighted average number of common shares outstanding - diluted |  |  | 35,613,319 |  |  | 36,572,146 |  |  | 37,867,212
Basic income per common share |  | $ | 3.86 |  | $ | 4.41 |  | $ | 1.93
Diluted income per common share |  | $ | 3.78 |  | $ | 4.32 |  | $ | 1.92
The following table summarizes shares excluded from the calculation of diluted income per share because their effect would have been anti-dilutive:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Anti-dilutive common stock equivalents: |  |  |  |  |  |  |  |  |
RSAs with service-based conditions |  |  | 5,192 |  |  | 458 |  |  | 35,182
RSAs with market-based conditions |  |  | 7,498 |  |  | — |  |  | 6,323
RSAs with performance-based conditions |  |  | — |  |  | — |  |  | —
Stock options |  |  | 72,515 |  |  | 45,308 |  |  | 432,287
Total anti-dilutive common stock equivalents |  |  | 85,205 |  |  | 45,766 |  |  | 473,792

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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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