CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 26, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 95,975	$ 109,289
Short-term investments	64,984	64,995
Accounts receivable, net	63,811	83,959
Inventories, net	55,110	43,094
Deferred income taxes, net	5,508	5,936
Prepaid expenses and other current assets	21,997	17,021
Total current assets	307,385	324,294
Property and equipment:
Machinery and equipment	50,493	45,254
Furniture and fixtures	5,921	6,156
Leasehold improvements	19,537	19,676
Property and equipment at cost	75,951	71,086
Less: accumulated depreciation and amortization	(42,215)	(41,741)
Property and equipment, net	33,736	29,345
Goodwill	26,600	19,205
Intangible assets, net	16,171	9,109
Service and demonstration inventory, net	32,666	36,886
Deferred income taxes, net	6,498	6,624
Total assets	423,056	425,463
Current liabilities:
Accounts payable	12,473	15,437
Accrued liabilities	21,230	26,127
Current portion of unearned service revenues	23,771	23,572
Customer deposits	1,517	2,046
Total current liabilities	58,991	67,182
Unearned service revenues - less current portion	13,176	13,799
Deferred income tax liability	1,942
Other long-term liabilities	2,858	628
Total liabilities	$ 76,967	$ 81,609
Commitments and contingencies - See Note 16
Shareholders' equity:
Common stock - par value $.001, 50,000,000 shares authorized; 18,077,594 and 17,997,665 issued; 17,397,359 and 17,317,430 outstanding, respectively	$ 18	$ 18
Additional paid-in capital	206,459	200,090
Retained earnings	163,444	159,516
Accumulated other comprehensive loss	(14,757)	(6,695)
Common stock in treasury, at cost - 680,235 shares	(9,075)	(9,075)
Total shareholders' equity	346,089	343,854
Total liabilities and shareholders' equity	$ 423,056	$ 425,463