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Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Mar. 31, 2013	Apr. 01, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 8,545,000	$ 10,565,000
Provision for income taxes (in percentage)	35.80%	29.60%
Research credit recognized	734,000
Possible reduction in liabilities for uncertain tax positions	$ 2,200,000

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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