CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
NET SALES	$ 179,337	$ 156,975	$ 536,955	$ 446,123
COST OF SALES	98,823	89,160	296,358	251,354
GROSS PROFIT	80,514	67,815	240,597	194,769
OPERATING EXPENSES:
Selling, general and administrative	54,716	53,198	169,896	138,556
Research and development	12,838	11,424	38,676	33,440
Contingent consideration (benefit) expense	20	(94)	39	99
Acquired in-process research and development	12,061	300	12,136	400
Total operating expenses	79,635	64,828	220,747	172,495
INCOME FROM OPERATIONS	879	2,987	19,850	22,274
OTHER INCOME (EXPENSE):
Interest income	94	29	266	55
Interest expense	(1,590)	(3,022)	(5,935)	(6,120)
Gain on bargain purchase	(778)	0	10,796	0
Other income (expense) — net	(810)	1	(376)	(445)
Other income (expense) — net	(3,084)	(2,992)	4,751	(6,510)
INCOME (LOSS) BEFORE INCOME TAXES	(2,205)	(5)	24,601	15,764
INCOME TAX EXPENSE (BENEFIT)	1,400	(978)	3,900	3,100
NET INCOME (LOSS)	$ (3,569)	$ 973	$ 20,717	$ 12,615
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ (0.07)	$ 0.02	$ 0.43	$ 0.28
Diluted (in dollars per share)	$ (0.07)	$ 0.02	$ 0.42	$ 0.28
AVERAGE COMMON SHARES:
Basic (in shares)	50,150	44,447	48,332	44,346
Diluted (in shares)	51,599	45,000	49,555	44,763