CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 140,960	$ 106,169
Short-term investments	10,997	42,942
Accounts receivable, net	72,105	61,364
Inventories, net	53,786	51,886
Prepaid expenses and other current assets	16,311	16,304
Total current assets	294,159	278,665
Property and equipment:
Machinery and equipment	66,514	57,063
Furniture and fixtures	6,945	6,099
Leasehold improvements	19,872	18,778
Property and equipment at cost	93,331	81,940
Less: accumulated depreciation and amortization	(61,452)	(50,262)
Property and equipment, net	31,879	31,678
Goodwill	52,750	46,744
Intangible assets, net	22,540	22,279
Service and sales demonstration inventory, net	39,614	29,136
Deferred income tax assets, net	15,606	14,307
Other long-term assets	2,030	905
Total assets	458,578	423,714
Current liabilities:
Accounts payable	11,569	11,126
Accrued liabilities	27,362	24,572
Income taxes payable	4,676	618
Current portion of unearned service revenues	29,674	27,422
Customer deposits	2,604	2,872
Total current liabilities	75,885	66,610
Unearned service revenues - less current portion	11,815	13,813
Deferred income tax liabilities	695	1,409
Income taxes payable - less current portion	15,952	0
Other long-term liabilities	2,165	2,225
Total liabilities	106,512	84,057
Commitments and contingencies
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; 18,277,142 and 18,170,267 issued; 16,796,884 and 16,680,791 outstanding, respectively	18	18
Additional paid-in capital	223,055	212,602
Retained earnings	168,624	183,436
Accumulated other comprehensive loss	(7,822)	(24,561)
Common stock in treasury, at cost - 1,480,258 shares and 1,489,476, respectively	(31,809)	(31,838)
Total shareholders’ equity	352,066	339,657
Total liabilities and shareholders’ equity	$ 458,578	$ 423,714