CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
NET SALES	$ 994,852	$ 882,753	$ 727,852
COST OF SALES	562,486	487,983	401,599
GROSS PROFIT	432,366	394,770	326,253
OPERATING EXPENSES:
Selling, general and administrative	327,274	276,018	229,134
Research and development	65,615	59,532	51,403
Impairment and other charges	23,750	657	809
Contingent consideration (benefit)	(232)	(698)	(298)
Acquired in-process research and development	525	644	12,136
Total operating expenses	416,932	336,153	293,184
INCOME FROM OPERATIONS	15,434	58,617	33,069
OTHER INCOME (EXPENSE):
Interest income	(291)	1,199	381
Interest expense	(12,413)	(10,360)	(7,736)
Gain on bargain purchase			11,039
Other income (expense) - net	(537)	63	(872)
Total other income (expense) - net	(13,241)	(9,098)	2,812
INCOME BEFORE INCOME TAXES	2,193	49,519	35,881
INCOME TAX EXPENSE (BENEFIT)	(3,258)	7,502	8,358
NET INCOME	$ 5,451	$ 42,017	$ 27,523
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.10	$ 0.80	$ 0.56
Diluted (in dollars per share)	$ 0.10	$ 0.78	$ 0.55
AVERAGE COMMON SHARES:
Basic (in shares)	55,075	52,268	48,805
Diluted (in shares)	56,235	53,931	50,101