CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 120,278	$ 107,356
Short-term investments	42,952	42,994
Accounts receivable, net	60,122	69,918
Inventories, net	48,614	45,571
Deferred income taxes, net	7,754	7,792
Prepaid expenses and other current assets	19,573	18,527
Total current assets	299,293	292,158
Property and equipment:
Machinery and equipment	55,982	54,124
Furniture and fixtures	6,188	5,945
Leasehold improvements	19,182	18,471
Property and equipment at cost	81,352	78,540
Less: accumulated depreciation and amortization	(45,714)	(42,594)
Property and equipment, net	35,638	35,946
Goodwill	27,365	26,371
Intangible assets, net	16,030	15,985
Service and sales demonstration inventory, net	34,849	33,709
Deferred income taxes, net	4,124	4,050
Other long term assets	955	967
Total assets	418,254	409,186
Current liabilities:
Accounts payable	10,171	11,345
Accrued liabilities	18,845	22,574
Income taxes payable	576
Current portion of unearned service revenues	26,471	26,114
Customer deposits	2,368	2,998
Total current liabilities	58,431	63,031
Unearned service revenues - less current portion	16,676	15,025
Deferred income tax liability	887	686
Other long-term liabilities	2,916	2,800
Total liabilities	$ 78,910	$ 81,542
Commitments and contingencies - See Note 16
Shareholders' equity:
Common stock - par value $.001, 50,000,000 shares authorized; 18,141,098 and 18,077,594 issued; 16,651,622 and 16,588,118 outstanding, respectively	$ 18	$ 18
Additional paid-in capital	208,995	206,996
Retained earnings	175,409	172,329
Accumulated other comprehensive loss	(13,240)	(19,861)
Common stock in treasury, at cost - 1,489,476 shares	(31,838)	(31,838)
Total shareholders' equity	339,344	327,644
Total liabilities and shareholders' equity	$ 418,254	$ 409,186