CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 169,957	$ 185,633
Accounts receivable, net	59,821	64,616
Inventories, net	47,058	47,391
Prepaid expenses and other current assets	27,231	26,295
Total current assets	304,067	323,935
Non-current assets:
Property, plant and equipment, net	21,921	23,091
Operating lease right-of-use asset	24,616	26,107
Goodwill	56,269	57,541
Intangible assets, net	13,254	13,301
Service and sales demonstration inventory, net	31,323	31,831
Deferred income tax assets, net	46,208	47,450
Other long-term assets	2,300	2,336
Total assets	499,958	525,592
Current liabilities:
Accounts payable	15,969	14,121
Accrued liabilities	29,775	42,593
Income taxes payable	567	3,442
Current portion of unearned service revenues	37,842	39,149
Customer deposits	3,650	2,807
Lease liability	5,596	5,835
Total current liabilities	93,399	107,947
Unearned service revenues - less current portion	21,476	21,757
Lease liability - less current portion	20,965	22,131
Deferred income tax liabilities	642	787
Income taxes payable - less current portion	11,583	11,583
Other long-term liabilities	1,110	1,084
Total liabilities	149,175	165,289
Commitments and contingencies - See Note 12
Shareholders’ equity:
Common Stock, Value, Issued	19	19
Additional paid-in capital	291,603	287,979
Retained earnings	110,287	113,508
Accumulated other comprehensive loss	(20,334)	(10,160)
Common stock in treasury, at cost; 1,382,367 and 1,393,643 shares, respectively	(30,792)	(31,043)
Total shareholders’ equity	350,783	360,303
Total liabilities and shareholders’ equity	$ 499,958	$ 525,592