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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Net sales $ 182,717 $ 175,652 $ 509,938 $ 514,638
Cost of sales 142,401 132,582 405,661 386,783
Gross profit 40,316 43,070 104,277 127,855
Research and development expenses 5,593 5,415 17,703 15,859
Factory transition restructuring charges 0 446 0 6,145
Selling, general and administrative expenses 29,994 32,997 90,811 94,701
Operating income (loss) 4,729 4,212 (4,237) 11,150
Interest income (expense), net (1,177) (721) (3,526) (1,676)
Gain on sale of Guangzhou factory 0 0 36,978 0
Other income (expense), net (2,282) 61 (3,951) 2
Income before provision for income taxes 1,270 3,552 25,264 9,476
Provision for income taxes 311 1,824 2,233 2,945
Net income $ 959 $ 1,728 $ 23,031 $ 6,531
Earnings per share:        
Basic (in dollars per share) $ 0.07 $ 0.12 $ 1.65 $ 0.45
Diluted (in dollars per share) $ 0.07 $ 0.12 $ 1.63 $ 0.44
Shares used in computing earnings per share:        
Basic (in shares) 13,836 14,381 13,997 14,412
Diluted (in shares) 13,959 14,666 14,116 14,689