Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Product	$ 388,397	$ 360,344	$ 307,189
Services and other revenues	96,162	80,556	73,396
Total revenues	484,559	440,900	380,585
Cost of revenues:
Cost of product revenues	198,418	173,419	144,997
Cost of services and other revenues	38,211	33,621	32,189
Total cost of revenues	236,629	207,040	177,186
Gross profit	247,930	233,860	203,399
Operating expenses:
Research and development	35,160	27,802	29,105
Selling, general and administrative	167,581	156,475	138,995
Gain on business combination	(3,443)	0	0
Total operating expenses	199,298	184,277	168,100
Income from operations	48,632	49,583	35,299
Interest and other income (expense), net	(2,388)	(1,079)	(270)
Income before provision for income taxes	46,244	48,504	35,029
Provision for income taxes	15,484	17,986	11,050
Net income	$ 30,760	$ 30,518	$ 23,979
Net income per share:
Basic (in dollars per share)	$ 0.86	$ 0.86	$ 0.69
Diluted (in dollars per share)	$ 0.84	$ 0.83	$ 0.67
Weighted-average shares:
Basic (in shares)	35,857	35,650	34,736
Diluted (in shares)	36,718	36,622	35,777