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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
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, | ​
​ |  | 2021 |  | 2020 |  | 2019 |
​ | ​ | (in thousands, except per share data) |
Net income available to common stockholders | ​ | $ | 98,650 | ​ | $ | 49,982 | ​ | $ | 17,034 | ​
Weighted average common shares outstanding used in computing basic income per share | ​ |  | 33,555 | ​ |  | 33,257 | ​ |  | 32,559 | ​
Incremental options and RSUs | ​ |  | 713 | ​ |  | 871 | ​ |  | 1,269 | ​
Weighted average common shares used in computing diluted net income per share | ​ |  | 34,268 | ​ |  | 34,128 | ​ | ​ | 33,828 | ​
Net income per share | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 2.94 | ​ | $ | 1.50 | ​ | $ | 0.52 | ​
Diluted | ​ | $ | 2.88 | ​ | $ | 1.46 | ​ | $ | 0.50 | ​
Schedule of changes in accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Foreign |  | Defined benefit |  | ​ | ​ |
​ | ​ | currency | ​ | pension plan | ​ | Total |
​ | ​ | (in thousands) |
Balance at December 31, 2020 | ​ | $ | 3,945 | ​ | $ | (510) | ​ | $ | 3,435 | ​
Other comprehensive loss and pension reclassification | ​ |  | (1,881) | ​ |  | 211 | ​ |  | (1,670) | ​
Balance at December 31, 2021 | ​ | $ | 2,064 | ​ | $ | (299) | ​ | $ | 1,765 | ​

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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