Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 124,630	$ 93,233
Short-term investments	64,994	64,990
Accounts receivable, net	66,309	62,559
Inventories, net	48,940	48,894
Deferred income taxes, net	4,601	7,216
Prepaid expenses and other current assets	14,645	11,186
Total current assets	324,119	288,078
Property and Equipment:
Machinery and equipment	36,924	32,236
Furniture and fixtures	6,888	6,516
Leasehold improvements	11,765	10,897
Property and equipment at cost	55,577	49,649
Less: accumulated depreciation and amortization	(39,126)	(34,305)
Property and equipment, net	16,451	15,344
Goodwill	19,358	18,816
Intangible assets, net	8,112	7,048
Service inventory	19,033	19,125
Deferred income taxes, net	4,423	2,396
Total Assets	391,496	350,807
Current Liabilities:
Accounts payable	14,881	10,413
Accrued liabilities	20,133	18,216
Income taxes payable	1,690	4,886
Current portion of unearned service revenues	21,331	19,460
Customer deposits	2,910	2,662
Current portion of obligations under capital leases	8	45
Total current liabilities	60,953	55,682
Unearned service revenues - less current portion	13,414	11,221
Deferred income tax liability, net	1,171	1,149
Obligations under capital leases - less current portion	8	19
Total Liabilities	75,546	68,071
Commitments and contingencies - See Note 13
Shareholders' Equity:
Common stock - par value $.001, 50,000,000 shares authorized; 17,868,372 and 17,653,879 issued; 17,188,137 and 16,973,644 outstanding, respectively	18	18
Additional paid-in capital	191,874	181,094
Retained earnings	125,867	104,358
Accumulated other comprehensive income	7,266	6,341
Common stock in treasury, at cost - 680,235 shares	(9,075)	(9,075)
Total Shareholders' Equity	315,950	282,736
Total Liabilities and Shareholders' Equity	$ 391,496	$ 350,807