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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2020
EARNINGS PER SHARE |
Reconciliation of Basic and Diluted Earnings Per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ |  | June 30, 2020 | ​ | June 30, 2019 |
​ | ​ | Diluted |  | Basic |  | Diluted |  | Basic | ​
Consolidated operations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Income available to common stockholders | ​ | $ | 41,839 | ​ | $ | 41,839 | ​ | $ | 73,915 | ​ | $ | 73,915 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average equivalent shares | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares of common stock | ​ |  | 64,262 | ​ |  | 64,262 | ​ |  | 63,471 | ​ |  | 63,471 | ​
Effect of dilutive stock-based compensation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options | ​ |  | 1,661 | ​ |  | — | ​ |  | 2,533 | ​ |  | — | ​
Restricted stock | ​ |  | 461 | ​ |  | — | ​ |  | 228 | ​ |  | — | ​
Total average equivalent shares | ​ |  | 66,384 | ​ | ​ | 64,262 | ​ | ​ | 66,232 | ​ | ​ | 63,471 | ​
Net income per share | ​ | $ | 0.63 | ​ | $ | 0.65 | ​ | $ | 1.12 | ​ | $ | 1.16 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended | ​
​ | ​ | June 30, 2020 | ​ | June 30, 2019 | ​
​ | ​ | Diluted | ​ | Basic | ​ | Diluted | ​ | Basic |
Consolidated operations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Income available to common stockholders | ​ | $ | 97,092 | ​ | $ | 97,092 | ​ | $ | 136,919 | ​ | $ | 136,919 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average equivalent shares | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares of common stock | ​ |  | 64,135 | ​ |  | 64,135 | ​ |  | 63,219 | ​ |  | 63,219 | ​
Effect of dilutive stock-based compensation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options | ​ |  | 1,734 | ​ |  | — | ​ |  | 2,411 | ​ |  | — | ​
Restricted stock | ​ |  | 377 | ​ |  | — | ​ |  | 212 | ​ |  | — | ​
Total average equivalent shares | ​ |  | 66,246 | ​ | ​ | 64,135 | ​ | ​ | 65,842 | ​ | ​ | 63,219 | ​
Net income per share | ​ | $ | 1.47 | ​ | $ | 1.51 | ​ | $ | 2.08 | ​ | $ | 2.17 | ​

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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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