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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share | The reconciliation of basic and diluted earnings per share for the three and six months ended June 30, 2021 and 2020 is as follows:
| Three Months Ended
| June 30, 2021 |  | June 30, 2020
| Diluted |  | Basic |  | Diluted |  | Basic
Consolidated operations |  |  |  |  |  |  |
Income available to common stockholders | $ | 55,276 |  |  | $ | 55,276 |  |  | $ | 41,839 |  |  | $ | 41,839 |
Average equivalent shares |  |  |  |  |  |  |
Shares of common stock | 65,818 |  |  | 65,818 |  |  | 64,262 |  |  | 64,262 |
Effect of dilutive stock-based compensation |  |  |  |  |  |  |
Stock options | 1,727 |  |  | — |  |  | 1,661 |  |  | — |
Restricted stock | 541 |  |  | — |  |  | 461 |  |  | — |
Total average equivalent shares | 68,086 |  |  | 65,818 |  |  | 66,384 |  |  | 64,262 |
Net income per share | $ | 0.81 |  |  | $ | 0.84 |  |  | $ | 0.63 |  |  | $ | 0.65 |
| Six Months Ended
| June 30, 2021 |  | June 30, 2020
| Diluted |  | Basic |  | Diluted |  | Basic
Consolidated operations |  |  |  |  |  |  |
Income available to common stockholders | $ | 139,228 |  |  | $ | 139,228 |  |  | $ | 97,092 |  |  | $ | 97,092 |
Average equivalent shares |  |  |  |  |  |  |
Shares of common stock | 65,525 |  |  | 65,525 |  |  | 64,135 |  |  | 64,135 |
Effect of dilutive stock-based compensation |  |  |  |  |  |  |
Stock options | 1,804 |  |  | — |  | 1,734 |  |  | —
Restricted stock | 540 |  |  | — |  | 377 |  |  | —
Total average equivalent shares | 67,869 |  |  | 65,525 |  |  | 66,246 |  |  | 64,135 |
Net income per share | $ | 2.05 |  |  | $ | 2.12 |  |  | $ | 1.47 |  |  | $ | 1.51 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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