CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
NET SALES	$ 218,371	$ 255,532	$ 461,896	$ 493,881
COST OF SALES	134,155	143,568	273,896	277,281
GROSS PROFIT	84,216	111,964	188,000	216,600
OPERATING EXPENSES:
Selling, general and administrative	66,767	79,977	145,575	158,247
Research and development	14,026	16,332	28,898	32,375
Legal settlement	18,200		18,200
Impairment and other charges	3,875	548	7,720	548
Contingent consideration expense	343	2,406	5,240	3,181
Acquired in-process research and development		500		525
Total operating expenses	103,211	99,763	205,633	194,876
INCOME (LOSS) FROM OPERATIONS	(18,995)	12,201	(17,633)	21,724
OTHER INCOME (EXPENSE):
Interest income	88	342	167	698
Interest expense	(2,715)	(3,115)	(5,859)	(5,879)
Other expense - net	(678)	(429)	(967)	(698)
Total other expense - net	(3,305)	(3,202)	(6,659)	(5,879)
INCOME (LOSS) BEFORE INCOME TAXES	(22,300)	8,999	(24,292)	15,845
INCOME TAX (BENEFIT) EXPENSE	(3,242)	2,140	(2,080)	2,791
NET INCOME (LOSS)	$ (19,058)	$ 6,859	$ (22,212)	$ 13,054
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ (0.34)	$ 0.12	$ (0.40)	$ 0.24
Diluted (in dollars per share)	$ (0.34)	$ 0.12	$ (0.40)	$ 0.23
AVERAGE COMMON SHARES:
Basic (in shares)	55,406	55,017	55,326	54,967
Diluted (in shares)	55,406	56,555	55,326	56,523