Restructuring Charges (Details) (USD $)	3 Months Ended	9 Months Ended
Oct. 01, 2011 Employee	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Restructuring charges (Textual) [Abstract]
Reduction in number of global workforce	46
Percentage reduction in global workforce	2.00%
Restructuring charges	$ 3,400,000	$ 4,276,000	$ 3,369,000	$ 4,276,000
Restructuring charges accrued			$ 0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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