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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2023
Summary of Significant Accounting Policies |
Schedule of reconciliation of shares used to determine net income per share | The reconciliation of shares used to determine net income per share is as follows (dollars in thousands, unaudited): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months |  | Six Months
​ | ​ | ended June 30, | ​ | ended June 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Net income | ​ | $ | 19,189 | ​ | $ | 39,810 | ​ | $ | 34,720 | ​ | $ | 69,365
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of shares – basic | ​ |  | 45,339,570 | ​ | ​ | 44,960,464 | ​ | ​ | 45,319,155 | ​ | ​ | 44,870,642
Shares underlying options | ​ | ​ | 1,957,849 | ​ | ​ | 2,191,793 | ​ | ​ | 1,986,041 | ​ | ​ | 2,103,799
Weighted average number of shares – diluted | ​ | ​ | 47,297,419 | ​ | ​ | 47,152,257 | ​ | ​ | 47,305,196 | ​ | ​ | 46,974,441

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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