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Net Income Per Share: | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Income Per Share [Text Block] | Net Income Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding during the period plus dilutive securities. Dilutive securities include outstanding common stock options and unvested restricted stock units, less the number of shares that could have been purchased with the proceeds from the exercise of the options, using the treasury stock method. Options and restricted stock units that are anti-dilutive are not included in the treasury stock method calculation. There were 12,235 and 14,017 anti-dilutive securities for the three months ended September 30, 2021 and 2020, respectively. There were 12,132 and 12,182 anti-dilutive securities for the nine months ended September 30, 2021 and 2020, respectively. The following table presents the calculation of net earnings per common share (“EPS”) — basic and diluted (in thousands, except per share data):
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Net income | $ | 31,081 |  |  | $ | 24,986 |  |  | $ | 83,210 |  |  | $ | 60,728 |
Weighted-average number of common shares outstanding (for basic calculation) | 21,214 |  |  | 20,948 |  |  | 21,189 |  |  | 20,870 |
Dilutive securities | 516 |  |  | 608 |  |  | 546 |  |  | 691 |
Weighted-average common and common equivalent shares outstanding (for diluted calculation) | 21,730 |  |  | 21,556 |  |  | 21,735 |  |  | 21,561 |
EPS — basic | $ | 1.47 |  |  | $ | 1.19 |  |  | $ | 3.93 |  |  | $ | 2.91 |
EPS — diluted | $ | 1.43 |  |  | $ | 1.16 |  |  | $ | 3.83 |  |  | $ | 2.82 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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