CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
NET SALES	$ 963,875	$ 994,852	$ 882,753
COST OF SALES	562,698	562,486	487,983
GROSS PROFIT	401,177	432,366	394,770
OPERATING EXPENSES:
Selling, general and administrative	297,724	327,274	276,018
Research and development	57,537	65,615	59,532
Legal settlement	18,684
Impairment charges	36,504	23,750	657
Contingent consideration (benefit)	(7,960)	(232)	(698)
Acquired in-process research and development	250	525	644
Total operating expenses	402,739	416,932	336,153
INCOME (LOSS) FROM OPERATIONS	(1,562)	15,434	58,617
OTHER INCOME (EXPENSE):
Interest income	604	(291)	1,199
Interest expense	(9,994)	(12,413)	(10,360)
Other income (expense) - net	(2,279)	(537)	63
Total other expense - net	(11,669)	(13,241)	(9,098)
INCOME (LOSS) BEFORE INCOME TAXES	(13,231)	2,193	49,519
INCOME TAX (BENEFIT) EXPENSE	(3,388)	(3,258)	7,502
NET INCOME (LOSS)	$ (9,843)	$ 5,451	$ 42,017
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ (0.18)	$ 0.10	$ 0.80
Diluted (in dollars per share)	$ (0.18)	$ 0.10	$ 0.78
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	55,434	55,075	52,268
Diluted (in shares)	55,434	56,235	53,931