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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
NET SALES | $ 449,049 | $ 394,288 | $ 359,449
COST OF SALES | 254,682 | 212,296 | 193,981
GROSS PROFIT | 194,367 | 181,992 | 165,468
OPERATING EXPENSES: |  |  |
Selling, general, and administrative | 128,642 | 122,106 | 104,502
Research and development | 33,886 | 27,795 | 21,938
Intangible asset impairment charges | 8,089 | 0 | 0
Contingent consideration benefit | (4,094) | 0 | 0
Acquired in-process research and development | 0 | 2,450 | 5,838
Total operating expenses | 166,523 | 152,351 | 132,278
INCOME FROM OPERATIONS | 27,844 | 29,641 | 33,190
OTHER INCOME (EXPENSE): |  |  |
Interest income | 255 | 226 | 129
Interest expense | (8,044) | (604) | (789)
Other income (expense) — net | (216) | (1,645) | 345
Other expense — net | (8,005) | (2,023) | (315)
INCOME BEFORE INCOME TAXES | 19,839 | 27,618 | 32,875
INCOME TAX EXPENSE | 3,269 | 7,908 | 9,831
NET INCOME | $ 16,570 | $ 19,710 | $ 23,044
EARNINGS PER COMMON SHARE: |  |  |
Basic (in dollars per share) | $ 0.39 | $ 0.47 | $ 0.59
Diluted (in dollars per share) | $ 0.39 | $ 0.46 | $ 0.58
AVERAGE COMMON SHARES: |  |  |
Basic (in shares) | 42,607 | 42,176 | 39,086
Diluted (in shares) | 42,884 | 42,610 | 39,733

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