Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 122,716	$ 124,630
Short-term investments	64,994	64,994
Accounts receivable, net	64,739	66,309
Inventories, net	50,238	48,940
Deferred income taxes, net	5,082	4,601
Prepaid expenses and other current assets	15,183	14,645
Total current assets	322,952	324,119
Property and equipment:
Machinery and equipment	38,079	36,924
Furniture and fixtures	7,072	6,888
Leasehold improvements	12,307	11,765
Property and equipment at cost	57,458	55,577
Less: accumulated depreciation and amortization	(40,516)	(39,126)
Property and equipment, net	16,942	16,451
Goodwill	19,336	19,358
Intangible assets, net	8,273	8,112
Service inventory	20,345	19,033
Deferred income taxes, net	4,415	4,423
Total assets	392,263	391,496
Current liabilities:
Accounts payable	10,381	14,881
Accrued liabilities	18,533	20,133
Income taxes payable	31	1,690
Current portion of unearned service revenues	22,404	21,331
Customer deposits	2,289	2,910
Current portion of obligations under capital leases	6	8
Total current liabilities	53,644	60,953
Unearned service revenues - less current portion	13,608	13,414
Deferred income tax liability, net	1,233	1,171
Obligations under capital leases - less current portion	8	8
Total liabilities	68,493	75,546
Commitments and contingencies - See Note Q
Shareholders' equity:
Common stock - par value $.001, 50,000,000 shares authorized; 17,913,793 and 17,868,372 issued; 17,233,558 and 17,188,137 outstanding, respectively	18	18
Additional paid-in capital	194,797	191,874
Retained earnings	130,845	125,867
Accumulated other comprehensive income	7,185	7,266
Common stock in treasury, at cost - 680,235 shares	(9,075)	(9,075)
Total shareholders' equity	323,770	315,950
Total liabilities and shareholders' equity	$ 392,263	$ 391,496