Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 64,540	$ 50,722
Short-term investments	64,997	64,986
Accounts receivable, net	57,512	51,862
Inventories, net	49,934	28,242
Deferred income taxes, net	5,297	4,455
Prepaid expenses and other current assets	9,207	8,045
Total current assets	251,487	208,312
Property and Equipment:
Machinery and equipment	29,171	24,840
Furniture and fixtures	5,963	5,700
Leasehold improvements	10,233	9,682
Property and equipment at cost	45,367	40,222
Less: accumulated depreciation and amortization	(29,134)	(24,982)
Property and equipment, net	16,233	15,240
Goodwill	18,610	19,015
Intangible assets, net	6,849	7,204
Service inventory	17,316	13,726
Deferred income taxes, net	2,296	2,522
Total Assets	312,791	266,019
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	13,396	12,025
Accrued liabilities	18,076	15,208
Income taxes payable	2,682	1,138
Current portion of unearned service revenues	15,638	13,357
Customer deposits	4,072	3,679
Current portion of obligations under capital leases	84	91
Total current liabilities	53,948	45,498
Unearned service revenues-less current portion	9,540	6,758
Deferred tax liability, net	1,148	1,161
Obligations under capital leases-less current portion	257	125
Total Liabilities	64,893	53,542
Commitments and contingencies - See Note 13
Shareholders' Equity:
Common stock - par value $.001, 50,000,000 shares authorized; 17,381,110 and 16,894,374 issued; 16,700,875 and 16,214,139 outstanding, respectively	17	17
Additional paid-in-capital	169,780	156,310
Retained earnings	81,360	57,983
Accumulated other comprehensive income	5,816	7,242
Common stock in treasury, at cost-680,235 shares	(9,075)	(9,075)
Total Shareholders' Equity	247,898	212,477
Total Liabilities and Shareholders' Equity	$ 312,791	$ 266,019