Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net sales:
Products	$ 93,295	$ 77,294	$ 177,699	$ 157,534
Services	54,860	42,748	104,043	81,596
Total net sales	148,155	120,042	281,742	239,130
Cost of sales:
Cost of products	72,747	59,805	138,813	122,389
Cost of services	41,804	32,204	79,476	61,382
Total cost of sales	114,551	92,009	218,289	183,771
Gross profit	33,604	28,033	63,453	55,359
Operating expenses:
Sales and marketing	15,572	12,220	28,779	24,777
General and administrative	5,051	4,628	10,694	9,352
Engineering	6,136	5,155	13,124	10,949
Integration and transaction costs	25		73	20
Amortization of intangibles	1,841	619	3,823	1,238
Total operating expenses	28,625	22,622	56,493	46,336
Earnings from operations	4,979	5,411	6,960	9,023
Interest income	13	11	29	13
Interest expense	(30)	(13)	(145)	(25)
Earnings before income taxes	4,962	5,409	6,844	9,011
Income tax expense	2,032	2,190	2,806	3,631
Net earnings	$ 2,930	$ 3,219	$ 4,038	$ 5,380
Net earnings per common share:
Basic (in dollars per share)	$ 0.17	$ 0.19	$ 0.23	$ 0.32
Diluted (in dollars per share)	$ 0.16	$ 0.18	$ 0.22	$ 0.31
Weighted average common shares outstanding:
Basic (in shares)	17,600	17,053	17,566	17,012
Diluted (in shares)	18,103	17,445	17,986	17,383