CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenues:
Products	$ 378,627	$ 395,531	$ 478,830
Services	151,624	167,881	156,873
Total net revenues	530,251	563,412	635,703
Cost of revenues:
Products	143,765	159,264
Services	60,656	63,177
Amortization of intangible assets	50	1,468
Total cost of revenues	204,471	223,909
Gross profit	325,780	339,503
Operating expenses:
Research and development	90,390	95,249
Marketing and selling	133,049	133,890
General and administrative	81,181	77,578
Amortization of intangible assets	1,626	2,648
Restructuring (recoveries) costs, net	(165)	5,370
Total operating expenses	306,081	314,735
Operating income	19,699	24,768
Interest income	126	555
Interest expense	(1,771)	(1,574)
Other (expense) income, net	(1,138)	343
Income from continuing operations before income taxes	16,916	24,092	51,136
Provision for income taxes	2,188	2,939	4,049
Income from continuing operations, net of tax	14,728	21,153
Gain on divestiture of consumer business	0	0
Income from divested operations	0	0
Income from discontinued operations	0	0
Net income	14,728	21,153
Income per share from continuing operations, net of tax - basic and diluted	$ 0.38	$ 0.54
Income per share from discontinued operations – basic and diluted	$ 0.00	$ 0.00
Net income per common share - basic and diluted	$ 0.38	$ 0.54
Weighted-average common shares outstanding - basic	39,147	39,044
Weighted-average common shares outstanding - diluted	39,267	39,070
Scenario, Actual [Member]
Net revenues:
Products			478,830
Total net revenues			635,703
Cost of revenues:
Products			182,764
Services			63,670
Amortization of intangible assets			2,574
Total cost of revenues			249,008
Gross profit			386,695
Operating expenses:
Research and development			98,879
Marketing and selling			153,481
General and administrative			52,066
Amortization of intangible assets			4,254
Restructuring (recoveries) costs, net			24,838
Total operating expenses			333,518
Operating income			53,177
Interest income			210
Interest expense			(1,548)
Other (expense) income, net			(703)
Income from continuing operations before income taxes			51,136
Provision for income taxes			4,049
Income from continuing operations, net of tax			47,087
Gain on divestiture of consumer business			37,972
Income from divested operations			(7,832)
Income from discontinued operations			45,804
Net income			$ 92,891
Income per share from continuing operations, net of tax - basic and diluted			$ 1.21
Income per share from discontinued operations – basic and diluted			$ 1.18
Net income per common share - basic and diluted			$ 2.39
Weighted-average common shares outstanding - basic			38,804
Weighted-average common shares outstanding - diluted			38,836