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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