Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
SALES
Product	$ 212,635	$ 157,331	$ 117,714
Service	41,529	34,444	29,989
Total Sales	254,164	191,775	147,703
COST OF SALES
Product	82,408	54,571	46,293
Service	28,067	23,806	20,702
Total Cost of Sales (exclusive of depreciation and amortization, shown separately below)	110,475	78,377	66,995
GROSS PROFIT	143,689	113,398	80,708
OPERATING EXPENSES:
Selling	62,117	50,679	48,598
General and administrative	26,806	26,776	24,956
Depreciation and amortization	6,712	6,326	5,530
Research and development	15,196	12,690	12,613
Total operating expenses	110,831	96,471	91,697
INCOME (LOSS) FROM OPERATIONS	32,858	16,927	(10,989)
OTHER (INCOME) EXPENSE
Interest income	(101)	(105)	(253)
Other expense (income), net	1,217	2,783	(592)
Interest expense	37	34	14
INCOME (LOSS) BEFORE INCOME TAX EXPENSE	31,705	14,215	(10,158)
INCOME TAX EXPENSE	8,328	3,147	424
NET INCOME (LOSS)	$ 23,377	$ 11,068	$ (10,582)
NET INCOME (LOSS) PER SHARE - BASIC	$ 1.42	$ 0.69	$ (0.66)
NET INCOME (LOSS) PER SHARE - DILUTED	$ 1.39	$ 0.68	$ (0.66)
Weighted average shares - Basic	16,503,773	16,153,831	16,125,449
Weighted average shares - Diluted	16,868,471	16,365,826	16,125,449