CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 133,554	$ 140,960
Short-term investments	10,998	10,997
Accounts receivable, net	71,641	72,105
Inventories, net	60,349	53,786
Prepaid expenses and other current assets	21,086	16,311
Total current assets	297,628	294,159
Property and equipment:
Machinery and equipment	70,332	66,514
Furniture and fixtures	6,650	6,945
Leasehold improvements	20,039	19,872
Property and equipment at cost	97,021	93,331
Less: accumulated depreciation and amortization	(66,321)	(61,452)
Property and equipment, net	30,700	31,879
Goodwill	53,584	52,750
Intangible assets, net	23,842	22,540
Service and sales demonstration inventory, net	38,346	39,614
Deferred income tax assets, net	15,691	15,606
Other long-term assets	4,678	2,030
Total assets	464,469	458,578
Current liabilities:
Accounts payable	11,764	11,569
Accrued liabilities	24,950	27,362
Income taxes payable	1,672	4,676
Total current liabilities	71,509	75,885
Unearned service revenues - less current portion	13,291	11,815
Deferred income tax liabilities	590	695
Income taxes payable - less current portion	14,578	15,952
Other long-term liabilities	1,798	2,165
Total liabilities	101,766	106,512
Commitments and contingencies - See Note 16
Shareholders’ equity:
Common stock - par value $.001, 50,000,000 shares authorized; 18,440,073 and 18,277,142 issued, respectively; 16,978,758 and 16,796,884 outstanding, respectively	18	18
Additional paid-in capital	233,755	223,055
Retained earnings	172,649	168,624
Accumulated other comprehensive loss	(11,985)	(7,822)
Common stock in treasury, at cost; 1,461,315 and 1,480,258 shares, respectively	(31,734)	(31,809)
Total shareholders’ equity	362,703	352,066
Total liabilities and shareholders’ equity	464,469	458,578
Current portion of unearned service revenues
Current liabilities:
Current portion of unearned service revenues	30,179	29,674
Customer deposits	30,179	29,674
Customer deposits
Current liabilities:
Current portion of unearned service revenues	2,944	2,604
Customer deposits	$ 2,944	$ 2,604