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NET INCOME (LOSS) PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Calculation of basic and diluted net income (loss) 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 |
Schedule of anti-dilutive securities excluded from computation of earnings per share | 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 Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 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://fasb.org/us-gaap/role/ref/legacyRef -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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