CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 110,696	$ 108,783
Short-term investments	24,831	24,793
Accounts receivable, net	76,237	88,927
Inventories, net	74,586	65,444
Prepaid expenses and other current assets	24,210	28,795
Total current assets	310,560	316,742
Property and equipment:
Machinery and equipment	80,586	76,048
Furniture and fixtures	6,141	6,749
Leasehold improvements	20,311	20,304
Property and equipment at cost	107,038	103,101
Less: accumulated depreciation and amortization	(76,188)	(72,684)
Property and equipment, net	30,850	30,417
Operating lease right-of-use asset	18,876	0
Goodwill	71,097	67,274
Intangible assets, net	29,507	33,054
Service and sales demonstration inventory, net	38,351	39,563
Deferred income tax assets, net	14,696	14,719
Other long-term assets	4,416	4,475
Total assets	518,353	506,244
Current liabilities:
Accounts payable	14,351	20,093
Accrued liabilities	31,389	36,327
Income taxes payable	3,747	5,081
Lease liability	6,446	0
Total current liabilities	92,969	97,523
Unearned service revenues - less current portion	16,319	15,505
Lease liability - less current portion	14,363	0
Deferred income tax liabilities	2,541	736
Income taxes payable - less current portion	12,247	12,247
Other long-term liabilities	3,326	3,624
Total liabilities	141,765	129,635
Commitments and contingencies - See Note 16
Shareholders’ equity:
Common stock - par value $.001, 50,000,000 shares authorized; 18,731,586 and 18,676,059 issued, respectively; 17,317,875 and 17,253,011 outstanding, respectively	19	19
Additional paid-in capital	252,840	251,329
Retained earnings	175,178	175,353
Accumulated other comprehensive loss	(20,047)	(18,483)
Common stock in treasury, at cost; 1,413,711 and 1,423,048 shares, respectively	(31,402)	(31,609)
Total shareholders’ equity	376,588	376,609
Total liabilities and shareholders’ equity	518,353	506,244
Current portion of unearned service revenues
Current liabilities:
Current portion of unearned service revenues	34,189	32,878
Customer deposits	34,189	32,878
Customer deposits
Current liabilities:
Current portion of unearned service revenues	2,847	3,144
Customer deposits	$ 2,847	$ 3,144