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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue $ 263,209 $ 244,108 $ 771,462 $ 730,046
Cost of revenue (exclusive of depreciation, shown separately below) 134,705 131,073 401,185 400,432
Other operating expenses:        
Research and development 34,384 30,425 99,350 90,025
Selling, general and administrative 54,923 47,032 152,988 136,415
Depreciation 6,225 5,817 18,604 17,016
Restructuring and reorganization charges 209 814 3,029 4,277
Total operating expenses 230,446 215,161 675,156 648,165
Operating income 32,763 28,947 96,306 81,881
Other income (expense):        
Interest expense (3,636) (3,641) (10,861) (11,894)
Amortization of original issue discount (794) (751) (2,350) (2,221)
Interest and investment income, net 78 254 286 1,086
Other, net (5,875) (2,067) (6,530) (3,184)
Total other (10,227) (6,205) (19,455) (16,213)
Income before income taxes 22,536 22,742 76,851 65,668
Income tax provision (6,406) (9,176) (21,769) (20,222)
Net income $ 16,130 $ 13,566 $ 55,082 $ 45,446
Weighted-average shares outstanding:        
Basic 31,756 32,115 31,825 32,070
Diluted 31,960 32,273 32,033 32,296
Earnings per common share:        
Basic $ 0.51 $ 0.42 $ 1.73 $ 1.42
Diluted $ 0.50 $ 0.42 $ 1.72 $ 1.41