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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement [Abstract] |  |
NET SALES | $ 203,035 | $ 171,069
COST OF SALES | 114,979 | 95,127
GROSS PROFIT | 88,056 | 75,942
OPERATING EXPENSES: |  |
Selling, general and administrative | 64,913 | 57,771
Research and development | 14,322 | 12,525
Contingent consideration expense | 40 | 37
Total operating expenses | 79,275 | 70,333
INCOME FROM OPERATIONS | 8,781 | 5,609
OTHER INCOME (EXPENSE): |  |
Interest income | 146 | 83
Interest expense | (2,398) | (2,706)
Gain on bargain purchase | 0 | 12,243
Other income (expense) - net | (170) | 264
Other income (expense) — net | (2,422) | 9,884
INCOME BEFORE INCOME TAXES | 6,359 | 15,493
INCOME TAX EXPENSE | 1,090 | 690
NET INCOME | $ 5,269 | $ 14,803
EARNINGS PER COMMON SHARE: |  |
Basic (in dollars per share) | $ 0.10 | $ 0.33
Diluted (in dollars per share) | $ 0.10 | $ 0.32
AVERAGE COMMON SHARES: |  |
Basic (in shares) | 50,277 | 44,830
Diluted (in shares) | 51,910 | 45,820

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