CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Product revenues	$ 307,189	$ 247,654	$ 185,864
Services and other revenues	73,396	66,373	59,671
Total revenues	380,585	314,027	245,535
Cost of revenues:
Cost of product revenues	144,997	112,369	79,567
Cost of services and other revenues	32,189	31,070	30,184
Total cost of revenues	177,186	143,439	109,751
Gross profit	203,399	170,588	135,784
Operating expenses:
Research and development	29,105	23,726	22,042
Selling, general and administrative	138,995	119,736	97,520
Total operating expenses	168,100	143,462	119,562
Income from operations	35,299	27,126	16,222
Interest and other income (expense), net	(270)	(51)	(133)
Income before provision for income taxes	35,029	27,075	16,089
Provision for income taxes	11,050	10,897	5,700
Net income	$ 23,979	$ 16,178	$ 10,389
Net income per share:
Net income per share-basic	$ 0.69	$ 0.49	$ 0.31
Net income per share - diluted	$ 0.67	$ 0.47	$ 0.30
Weighted average shares outstanding:
Basic (in shares)	34,736	33,307	33,123
Diluted (in shares)	35,777	34,213	34,103