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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net sales $ 177,739 $ 146,966 $ 485,030 $ 396,351
Cost of sales 126,205 110,992 354,084 301,234
Gross profit 51,534 35,974 130,946 95,117
Research and development costs 4,877 5,918 14,381 16,301
Selling, general and administrative expenses 22,223 21,188 67,216 64,757
Restructuring charges 3,969 398 4,000 675
Gain on sale of property (1,596) (403) (1,596) (6,578)
Income from operations 22,061 8,873 46,945 19,962
Interest expense (944) (1,491) (2,411) (3,014)
Other (expense) income, net (429) (201) (2,926) 458
Earnings before provision for income taxes 20,688 7,181 41,608 17,406
Provision for income taxes 4,140 1,447 2,959 593
Net earnings available to common stockholders 16,548 5,734 38,649 16,813
Common Class A [Member]        
Net earnings available to common stockholders $ 2,715 $ 940 $ 6,327 $ 2,761
Net earnings per common share:        
Class A common share - basic and diluted (in dollars per share) $ 1.27 $ 0.44 $ 2.95 $ 1.29
Weighted-average number of shares outstanding:        
Class A common share - basic and diluted (in shares) 2,142 2,145 2,144 2,145
Common Class B [Member]        
Net earnings available to common stockholders $ 13,833 $ 4,794 $ 32,322 $ 14,052
Net earnings per common share:        
Class A common share - basic and diluted (in dollars per share) $ 1.34 $ 0.47 $ 3.12 $ 1.37
Weighted-average number of shares outstanding:        
Class A common share - basic and diluted (in shares) 10,340 10,269 10,358 10,237