CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
NET SALES	$ 186,549	$ 151,071	$ 357,618	$ 289,148
COST OF SALES	102,408	84,217	197,535	162,193
GROSS PROFIT	84,141	66,854	160,083	126,955
OPERATING EXPENSES:
Selling, general and administrative	57,409	43,653	115,180	85,358
Research and development	13,313	11,429	25,838	22,016
Contingent consideration (benefit) expense	(18)	91	19	193
Acquired in-process research and development	75	100	75	100
Total operating expenses	70,779	55,273	141,112	107,667
INCOME FROM OPERATIONS	13,362	11,581	18,971	19,288
OTHER INCOME (EXPENSE):
Interest income	89	16	172	25
Interest expense	(1,639)	(1,768)	(4,345)	(3,097)
Gain on bargain purchase	(669)	0	11,574	0
Other income (expense) — net	170	33	434	(447)
Other income (expense) — net	(2,049)	(1,719)	7,835	(3,519)
INCOME BEFORE INCOME TAXES	11,313	9,862	26,806	15,769
INCOME TAX EXPENSE	1,830	2,572	2,520	4,128
NET INCOME	$ 9,483	$ 7,290	$ 24,286	$ 11,641
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.19	$ 0.16	$ 0.51	$ 0.26
Diluted (in dollars per share)	$ 0.19	$ 0.16	$ 0.50	$ 0.26
AVERAGE COMMON SHARES:
Basic (in shares)	49,957	44,308	47,406	44,297
Diluted (in shares)	51,188	44,703	48,516	44,647