CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Number of Shares Outstanding, Diluted	80,707	73,202	71,441
REVENUE:
Product sales	$ 327,011	$ 310,458	$ 302,618
Services and other	32,775	38,561	27,781
Total revenue	359,786	349,019	330,399
COSTS AND EXPENSES:
Cost of product sales	110,770	117,499	133,982
Cost of services and other	19,775	25,659	15,379
Research and development	52,900	50,227	47,670
Selling, general and administrative	149,638	148,411	141,430
Litigation settlement	10,000	5,100	0
Restructuring charges	0	0	4,490
Total costs and expenses	343,083	346,896	342,951
Income (loss) from operations	16,703	2,123	(12,552)
Other income, net	752	652	802
Interest expense	6,609	6,373	12,711
Gain on sale of product line	0	0	9,295
Income (loss) before income taxes	10,846	(3,598)	(15,166)
Income tax provision	733	236	1,161
Net income (loss)	$ 10,113	$ (3,834)	$ (16,327)
Earnings Per Share, Basic	$ 0.13	$ (0.05)	$ (0.23)
Earnings Per Share, Diluted	$ 0.13	$ (0.05)	$ (0.23)
Weighted Average Number of Shares Outstanding, Basic	77,842	73,202	71,441