Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2012	Dec. 31, 2011
Accounts receivable
Accounts receivable	$ 112,152	$ 118,138
Less: allowances for doubtful accounts, returns and discounts	(9,404)	(8,252)
Accounts Receivable, Net, Current, Total	102,748	109,886
Inventories:
Raw materials	12,893	14,099
Work-in-process	4,300	4,250
Finished goods	50,814	52,300
Total inventories, net	68,007	70,649
Property and equipment:
Furniture and fixtures	7,308	6,706
Machinery and equipment	103,347	97,916
Leasehold improvements	7,493	7,079
Property, Plant and Equipment, Gross, Total	118,148	111,701
Less: accumulated depreciation and amortization	(78,580)	(71,232)
Property and equipment, net	$ 39,568	$ 40,469