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NET INCOME PER SHARE | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
NET INCOME PER SHARE | NET INCOME PER SHARE The following table sets forth the calculation of basic and diluted net income per share (in thousands except per share data):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |
Net income | $ | 314,963 |  |  | $ | 238,334 |  |  | $ | 122,695 |
Denominator: |  |  |  |  |  |  |  |
Denominator for basic net income per share — weighted-average outstanding shares | 36,310 |  |  | 36,058 |  |  | 33,200 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options, restricted stock awards and restricted stock units | 320 |  |  | 390 |  |  | 359 |
Denominator for diluted net income per share — weighted-average outstanding shares | 36,630 |  |  | 36,448 |  |  | 33,559 |
Net income per share — basic | $ | 8.67 |  |  | $ | 6.61 |  |  | $ | 3.70 |
Net income per share — diluted | $ | 8.60 |  |  | $ | 6.54 |  |  | $ | 3.66 |
The Company’s potentially dilutive securities include outstanding stock options, unvested stock-based awards which include restricted stock awards that vest over a specific service period, restricted stock awards that vest based on achievement of a performance condition, restricted stock awards with a performance and a market condition, restricted stock units and Matching RSUs awarded under the Company's Management Stock Purchase Plan. Shares underlying unvested restricted stock awards that vest based on performance and market conditions that have not been achieved as of the end of the period are not included in the computation of basic or diluted earnings per share. Diluted net income per share considers the impact of potentially dilutive securities except when the inclusion of the potentially dilutive securities would have an anti-dilutive effect. The following table summarizes the shares underlying the unvested performance-based restricted stock and anti-dilutive securities excluded from the basic and diluted earnings per share calculations (in thousands):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Performance-based restricted stock awards | 60 |  |  | 53 |  |  | 58 |
Anti-dilutive securities | 42 |  |  | 100 |  |  | 126 |

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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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