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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Statement [Abstract] |  |  |  |
NET SALES | $ 136,086 | $ 128,808 | $ 403,745 | $ 376,909
COST OF SALES | 76,881 | 71,387 | 228,271 | 211,821
GROSS PROFIT | 59,205 | 57,421 | 175,474 | 165,088
OPERATING EXPENSES: |  |  |  |
Selling, general, and administrative | 39,201 | 36,328 | 115,407 | 111,682
Research and development | 10,515 | 8,688 | 29,389 | 27,109
Intangible asset impairment charges | 0 | 1,102 | 0 | 1,102
Contingent consideration (benefit) expense | (58) | (773) | 185 | (754)
Acquired in-process research and development | 1,000 | 0 | 1,000 | 0
Total operating expenses | 50,658 | 45,345 | 145,981 | 139,139
INCOME FROM OPERATIONS | 8,547 | 12,076 | 29,493 | 25,949
OTHER INCOME (EXPENSE): |  |  |  |
Interest income | 78 | 41 | 210 | 187
Interest expense | (1,489) | (2,008) | (4,776) | (6,967)
Other income (expense) — net | (476) | 144 | (281) | 52
Other (expense) — net | (1,887) | (1,823) | (4,847) | (6,728)
INCOME BEFORE INCOME TAXES | 6,660 | 10,253 | 24,646 | 19,221
INCOME TAX EXPENSE | 1,842 | 2,489 | 7,253 | 4,918
NET INCOME | $ 4,818 | $ 7,764 | $ 17,393 | $ 14,303
EARNINGS PER COMMON SHARE: |  |  |  |
Basic (in dollars per share) | $ 0.11 | $ 0.18 | $ 0.40 | $ 0.33
Diluted (in dollars per share) | $ 0.11 | $ 0.18 | $ 0.39 | $ 0.33
AVERAGE COMMON SHARES: |  |  |  |
Basic (in shares) | 44,165 | 43,229 | 43,976 | 43,053
Diluted (in shares) | 44,734 | 43,398 | 44,467 | 43,315

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