CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net revenues:
Products	$ 283,110	$ 336,371	$ 378,627
Services	228,820	169,224	151,624
Total net revenues	511,930	505,595	530,251
Cost of revenues:
Products	111,579	131,881	143,765
Services	59,828	61,501	60,656
Amortization of intangible assets	7,800	4,063	50
Total cost of revenues	179,207	197,445	204,471
Gross profit	332,723	308,150	325,780
Operating expenses:
Research and development	81,564	95,898	90,390
Marketing and selling	110,338	122,511	133,049
General and administrative	61,471	74,109	81,181
Amortization of intangible assets	2,498	2,354	1,626
Restructuring costs (recoveries), net	12,837	6,305	(165)
Total operating expenses	268,708	301,177	306,081
Operating income	64,015	6,973	19,699
Interest income	0	113	126
Interest expense	(18,903)	(6,346)	(1,771)
Other income (expense), net	232	(175)	(1,138)
Income before income taxes	45,344	565	16,916
(Benefit from) provision for income taxes	(2,875)	(1,915)	2,188
Net income	$ 48,219	$ 2,480	$ 14,728
Net income per common share - basic and diluted	$ 1.20	$ 0.06	$ 0.38
Weighted-average common shares outstanding - basic	40,021	39,423	39,147
Weighted-average common shares outstanding - diluted	40,176	40,380	39,267