CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Product revenues	$ 247,654	$ 185,864	$ 171,100
Services and other revenues	66,373	59,671	51,307
Total revenues	314,027	245,535	222,407
Cost of revenues:
Cost of product revenues	112,369	79,567	76,372
Cost of services and other revenues	31,070	30,184	28,079
Cost of Revenues Restructuring Charges	0	0	39
Total cost of revenues	143,439	109,751	104,490
Gross profit	170,588	135,784	117,917
Operating expenses:
Research and development	23,726	22,042	21,007
Selling, general and administrative	119,736	97,520	86,227
Restructuring, Asset Impairment Charges	0	0	1,157
Total operating expenses	143,462	119,562	108,391
Income from operations	27,126	16,222	9,526
Interest and other income (expense), net	(51)	(133)	431
Income before provision for income taxes	27,075	16,089	9,957
Provision for income taxes	10,897	5,700	5,065
Net income	$ 16,178	$ 10,389	$ 4,892
Net income per share:
Net income per share-basic	$ 0.49	$ 0.31	$ 0.15
Net income per share - diluted	$ 0.47	$ 0.30	$ 0.15
Weighted average shares outstanding:
Basic (in shares)	33,307	33,123	32,651
Diluted (in shares)	34,213	34,103	33,513