CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net revenues:
Products	$ 336,371	$ 378,627	$ 395,531
Services	169,224	151,624	167,881
Total net revenues	505,595	530,251	563,412
Cost of revenues:
Products	131,881	143,765	159,264
Services	61,501	60,656	63,177
Amortization of intangible assets	4,063	50	1,468
Total cost of revenues	197,445	204,471	223,909
Gross profit	308,150	325,780	339,503
Operating expenses:
Research and development	95,898	90,390	95,249
Marketing and selling	122,511	133,049	133,890
General and administrative	74,109	81,181	77,578
Amortization of intangible assets	2,354	1,626	2,648
Restructuring costs (recoveries), net	6,305	(165)	5,370
Total operating expenses	301,177	306,081	314,735
Operating income	6,973	19,699	24,768
Interest income	113	126	555
Interest expense	(6,346)	(1,771)	(1,574)
Other (expense) income, net	(175)	(1,138)	343
Income before income taxes	565	16,916	24,092
(Benefit) provision for income taxes	(1,915)	2,188	2,939
Net income	$ 2,480	$ 14,728	$ 21,153
Net income per common share - basic and diluted	$ 0.06	$ 0.38	$ 0.54
Weighted-average common shares outstanding - basic	39,423	39,147	39,044
Weighted-average common shares outstanding - diluted	40,380	39,267	39,070