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NET INCOME PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The calculation of basic and diluted net income per share is determined using net income applicable to common stockholders as the numerator and the number of shares included in the denominator as follows (in thousands, except per share amounts):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Basic net income per share: |  |  |  |  |  |  |
Net income applicable to common stockholders | $ | 30,960 |  |  | $ | 31,902 |  |  | $ | 45,740 |  |  | $ | 53,174 |
Weighted average common shares outstanding | 55,197 |  |  | 57,879 |  |  | 55,233 |  |  | 57,836 |
Basic net income per share | $ | 0.56 |  |  | $ | 0.55 |  |  | $ | 0.83 |  |  | $ | 0.92 |
Diluted net income per share: |  |  |  |  |  |  |
Net income applicable to common stockholders | $ | 30,960 |  |  | $ | 31,902 |  |  | $ | 45,740 |  |  | $ | 53,174 |
Weighted average common shares outstanding | 55,197 |  |  | 57,879 |  |  | 55,233 |  |  | 57,836 |
Dilutive shares from assumed conversion of convertible senior notes | — |  |  | 435 |  |  | — |  |  | 1,073 |
Dilutive stock options and restricted stock | 471 |  |  | 960 |  |  | 486 |  |  | 1,114 |
Diluted weighted average common shares outstanding | 55,668 |  |  | 59,274 |  |  | 55,719 |  |  | 60,023 |
Diluted net income per share | $ | 0.56 |  |  | $ | 0.54 |  |  | $ | 0.82 |  |  | $ | 0.89 |

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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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