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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Summary of Significant Accounting Policies |
Schedule of estimated useful lives of the related assets | ​
​ | ​ | ​ | ​ | ​ | ​
Asset Classification |  | Estimated Useful Life
Land, buildings and equipment (under lease) |  | ​ | Lesser of the lease term or estimated useful life of the asset | ​ | ​
Machinery and equipment |  | ​ | 3 to 10 years | ​ | ​
Schedule of components of net income per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
​ | ​ | Year ended December 31, | ​
​ |  | 2024 |  | 2023 |  | 2022 |
​ | ​ | (in thousands, except per share data) |
Net income available to common stockholders | ​ | $ | 200,992 | ​ | $ | 246,263 | ​ | $ | 183,079 | ​
Weighted average shares of common stock outstanding used in computing basic income per share | ​ |  | 32,552 | ​ |  | 32,758 | ​ |  | 33,043 | ​
Incremental options and RSUs | ​ |  | 152 | ​ |  | 407 | ​ |  | 499 | ​
Weighted average shares of common stock used in computing diluted net income per share | ​ |  | 32,704 | ​ |  | 33,165 | ​ | ​ | 33,542 | ​
Net income per share | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 6.17 | ​ | $ | 7.52 | ​ | $ | 5.54 | ​
Diluted | ​ | $ | 6.15 | ​ | $ | 7.43 | ​ | $ | 5.46 | ​
Schedule of changes in accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Foreign |  | Defined benefit |  | ​ | ​ |
​ | ​ | currency | ​ | pension plan | ​ | Total |
​ | ​ | (in thousands) |
Balance at December 31, 2023 | ​ | $ | (1,956) | ​ | $ | 110 | ​ | $ | (1,846) | ​
Other comprehensive loss and pension reclassification | ​ |  | (4,297) | ​ |  | (71) | ​ |  | (4,368) | ​
Balance at December 31, 2024 | ​ | $ | (6,253) | ​ | $ | 39 | ​ | $ | (6,214) | ​

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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