Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Product	$ 100,941	$ 92,229	$ 284,204	$ 260,053
Services and other revenues	24,293	20,314	70,039	59,306
Total revenues	125,234	112,543	354,243	319,359
Cost of revenues:
Cost of product revenues	51,700	44,510	143,319	124,413
Cost of services and other revenues	9,831	8,487	28,074	24,865
Total cost of revenues	61,531	52,997	171,393	149,278
Gross profit	63,703	59,546	182,850	170,081
Operating expenses:
Research and development	9,176	7,078	25,941	19,670
Selling, general and administrative	40,668	38,871	123,690	114,302
Gain on business combination	0	0	(3,443)	0
Total operating expenses	49,844	45,949	146,188	133,972
Income from operations	13,859	13,597	36,662	36,109
Other income (expense), net	(646)	(706)	(1,635)	(1,003)
Income before provision for income taxes	13,213	12,891	35,027	35,106
Provision for income taxes	5,177	5,591	11,922	13,824
Net income	$ 8,036	$ 7,300	$ 23,105	$ 21,282
Net income per share:
Basic (in dollars per share)	$ 0.22	$ 0.20	$ 0.64	$ 0.60
Diluted (in dollars per share)	$ 0.22	$ 0.20	$ 0.63	$ 0.58
Weighted-average shares outstanding:
Basic (in shares)	35,806	35,994	35,983	35,634
Diluted (in shares)	36,613	36,832	36,870	36,617