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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue $ 121,172 $ 127,416 $ 225,149 $ 252,805
Cost of sales 89,403 100,670 168,269 195,325
Gross profit 31,769 26,746 56,880 57,480
Research and development costs 6,116 6,862 12,175 14,036
Selling, general and administrative expenses 18,061 19,215 40,122 38,440
Restructuring charges 44 424 172 1,370
Gain on sale of property 0 (4,257) 0 (4,257)
Income from operations 7,548 4,502 4,411 7,891
Interest expense (1,250) (1,381) (2,601) (2,820)
Other (expense) income, net (302) 267 (390) (513)
Earnings before provision for (benefit from) income taxes 5,996 3,388 1,420 4,558
Provision for (benefit from) income taxes 423 421 (349) 460
Net earnings available to common stockholders 5,573 2,967 1,769 4,098
Common Class A [Member]        
Net earnings available to common stockholders $ 923 $ 494 $ 274 $ 673
Net earnings per common share:        
Common shares - basic and diluted (in dollars per share) $ 0.43 $ 0.23 $ 0.13 $ 0.31
Weighted-average number of shares outstanding:        
Common shares - basic and diluted (in shares) 2,145 2,175 2,145 2,175
Common Class B [Member]        
Net earnings available to common stockholders $ 4,650 $ 2,473 $ 1,495 $ 3,425
Net earnings per common share:        
Common shares - basic and diluted (in dollars per share) $ 0.46 $ 0.24 $ 0.15 $ 0.34
Weighted-average number of shares outstanding:        
Common shares - basic and diluted (in shares) 10,178 10,112 10,151 10,100