Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2012	Dec. 31, 2011
Accounts receivable
Accounts receivable	$ 119,320	$ 118,138
Less: allowances for doubtful accounts, returns and discounts	(7,567)	(8,252)
Accounts Receivable, Net, Current, Total	111,753	109,886
Inventories:
Raw materials	13,708	14,099
Work-in-process	3,354	4,250
Finished goods	48,483	52,300
Total inventories, net	65,545	70,649
Property and equipment:
Furniture and fixtures	6,681	6,706
Machinery and equipment	101,379	97,916
Leasehold improvements	7,459	7,079
Property, Plant and Equipment, Gross, Total	115,519	111,701
Less: accumulated depreciation and amortization	(75,080)	(71,232)
Property and equipment, net	$ 40,439	$ 40,469