Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 116,910	$ 124,630
Short-term investments	64,996	64,994
Accounts receivable, net	68,939	66,309
Inventories, net	56,482	48,940
Deferred income taxes, net	5,883	4,601
Prepaid expenses and other current assets	15,901	14,645
Total current assets	329,111	324,119
Property and equipment:
Machinery and equipment	41,115	36,924
Furniture and fixtures	6,928	6,888
Leasehold improvements	15,482	11,765
Property and equipment at cost	63,525	55,577
Less: accumulated depreciation and amortization	(41,756)	(39,126)
Property and equipment, net	21,769	16,451
Goodwill	19,579	19,358
Intangible assets, net	8,834	8,112
Service inventory	21,589	19,033
Deferred income taxes, net	8,845	4,423
Total assets	409,727	391,496
Current liabilities:
Accounts payable	9,853	14,881
Accrued liabilities	23,434	20,133
Income taxes payable	418	1,690
Current portion of unearned service revenues	22,464	21,331
Customer deposits	1,223	2,910
Current portion of obligations under capital leases	8	8
Total current liabilities	57,400	60,953
Unearned service revenues - less current portion	13,635	13,414
Deferred income tax liability	1,203	1,171
Obligations under capital leases - less current portion	2	8
Other long-term liabilities	481
Total liabilities	72,721	75,546
Commitments and contingencies - See Note P
Shareholders' equity:
Common stock - par value $.001, 50,000,000 shares authorized; 17,954,933 and 17,868,372 issued; 17,274,698 and 17,188,137 outstanding, respectively	18	18
Additional paid-in capital	198,202	191,874
Retained earnings	148,394	125,867
Accumulated other comprehensive income	(533)	7,266
Common stock in treasury, at cost - 680,235 shares	(9,075)	(9,075)
Total shareholders' equity	337,006	315,950
Total liabilities and shareholders' equity	$ 409,727	$ 391,496