CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Product revenues	$ 82,580	$ 69,236
Services and other revenues	19,184	17,874
Total revenues	101,764	87,110
Cost of revenues:
Cost of product revenues	38,900	33,547
Cost of services and other revenues	8,369	8,196
Total cost of revenues	47,269	41,743
Gross profit	54,495	45,367
Operating expenses:
Research and development	6,121	7,954
Selling, general and administrative	38,420	33,244
Total operating expenses	44,541	41,198
Income from operations	9,954	4,169
Interest and other income (expense), net	(256)	(223)
Income before provision for income taxes	9,698	3,946
Provision for income taxes	3,504	561
Net income	$ 6,194	$ 3,385
Net income per share:
Net income per share-basic	$ 0.18	$ 0.10
Net income per share - diluted	$ 0.17	$ 0.10
Weighted average shares outstanding:
Basic (in shares)	35,225	33,900
Diluted (in shares)	36,305	34,820