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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2020
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 nine months ended September 30, 2020 and 2019 is as follows: ​ ​
​ | Three Months Ended
​ | September 30, 2020 |  | September 30, 2019
​ | Diluted |  | Basic |  | Diluted |  | Basic
Consolidated operations | ​ |  | ​ |  | ​ |  | ​
Income available to common stockholders | $ | 63,716 |  |  | $ | 63,716 |  |  | $ | 56,750 |  |  | $ | 56,750 |
​ | ​ |  | ​ |  | ​ |  | ​
Average equivalent shares | ​ |  | ​ |  | ​ |  | ​
Shares of common stock | 64,562 |  |  | 64,562 |  |  | 64,010 |  |  | 64,010 |
Effect of dilutive stock-based compensation | ​ |  | ​ |  | ​ |  | ​
Stock options | 1,809 |  |  | — |  |  | 2,367 |  |  | — |
Restricted stock | 551 |  |  | — |  |  | 325 |  |  | — |
Total average equivalent shares | 66,922 |  |  | 64,562 |  |  | 66,702 |  |  | 64,010 |
Net income per share | $ | 0.95 |  |  | $ | 0.99 |  |  | $ | 0.85 |  |  | $ | 0.89 |
​
​ | Nine Months Ended
​ | September 30, 2020 |  | September 30, 2019
​ | Diluted |  | Basic |  | Diluted |  | Basic
Consolidated operations | ​ |  | ​ |  | ​ |  | ​
Income available to common stockholders | $ | 160,808 |  |  | $ | 160,808 |  |  | $ | 193,669 |  |  | $ | 193,669 |
​ | ​ |  | ​ |  | ​ |  | ​
Average equivalent shares | ​ |  | ​ |  | ​ |  | ​
Shares of common stock | 64,278 |  |  | 64,278 |  |  | 63,485 |  |  | 63,485 |
Effect of dilutive stock-based compensation | ​ |  | ​ |  | ​ |  | ​
Stock options | 1,770 |  |  | — |  | 2,425 |  |  | —
Restricted stock | 435 |  |  | — |  | 253 |  |  | —
Total average equivalent shares | 66,483 |  |  | 64,278 |  |  | 66,163 |  |  | 63,485 |
Net income per share | $ | 2.42 |  |  | $ | 2.50 |  |  | $ | 2.93 |  |  | $ | 3.05 |

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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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