CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 109,289	$ 124,630
Short-term investments	64,995	64,994
Accounts receivable, net	83,959	66,309
Inventories, net	59,334	48,940
Deferred income taxes, net	5,936	4,601
Prepaid expenses and other current assets	17,021	14,645
Total current assets	340,534	324,119
Property and equipment:
Machinery and equipment	45,254	36,924
Furniture and fixtures	6,156	6,888
Leasehold improvements	19,676	11,765
Property and equipment at cost	71,086	55,577
Less: accumulated depreciation and amortization	(41,741)	(39,126)
Property and equipment, net	29,345	16,451
Goodwill	19,205	19,358
Intangible assets, net	9,109	8,112
Service inventory	20,646	19,033
Deferred income taxes, net	6,624	4,423
Total assets	425,463	391,496
Current liabilities:
Accounts payable	15,437	14,881
Accrued liabilities	26,127	20,141
Income taxes payable		1,690
Current portion of unearned service revenues	23,572	21,331
Customer deposits	2,046	2,910
Total current liabilities	67,182	60,953
Unearned service revenues - less current portion	13,799	13,414
Deferred income tax liability		1,171
Other long-term liabilities	628	8
Total liabilities	81,609	75,546
Commitments and contingencies - See Note 12
Shareholders' equity:
Preferred stock - par value $0.01, 10,000,000 shares authorized; none issued	0	0
Common stock - par value $.001, 50,000,000 shares authorized; 17,997,665 and 17,868,372 issued; 17,317,430 and 17,188,137 outstanding, respectively	18	18
Additional paid-in capital	200,090	191,874
Retained earnings	159,516	125,867
Accumulated other comprehensive (loss) income	(6,695)	7,266
Common stock in treasury, at cost - 680,235 shares	(9,075)	(9,075)
Total shareholders' equity	343,854	315,950
Total liabilities and shareholders' equity	$ 425,463	$ 391,496