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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2022
Schedule of computation of basic and diluted earnings per share | The following table sets forth the computation of basic and diluted earnings per share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ |  | June 30, 2022 |  | June 30, 2021
​ | ​ | (in thousands)
Numerator: | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 8,224 | ​ | $ | 372,837
​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator (number of shares in thousands): | ​ | ​ | ​ | ​ | ​ | ​
Basic weighted average common shares outstanding | ​ |  | 20,689 | ​ |  | 20,354
Effect of dilutive securities: | ​ |  | ​ | ​ |  | ​
Dilutive effect of non-vested shares | ​ |  | 19 | ​ |  | 245
Diluted weighted average common shares outstanding | ​ |  | 20,708 | ​ |  | 20,599
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended
​ |  | June 30, 2022 |  | June 30, 2021
​ | ​ | (in thousands)
Numerator: | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 339,689 | ​ | $ | 669,617
​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator (number of shares in thousands): | ​ |  | ​ | ​ |  | ​
Basic weighted average common shares outstanding | ​ | ​ | 20,693 | ​ | ​ | 20,323
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​
Dilutive effect of non-vested shares | ​ | ​ | 19 | ​ | ​ | 234
Diluted weighted average common shares outstanding | ​ | ​ | 20,712 | ​ | ​ | 20,557

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration