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Income Taxes (Narrative) (Details) (USD $)	3 Months Ended			6 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Jun. 30, 2013	Mar. 31, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Income Tax Disclosure [Abstract]
Income tax provision	$ 7,144,000		$ 9,933,000	$ 15,689,000	$ 20,498,000
Provision for income taxes (in percentage)	33.80%		31.60%	34.90%	30.50%
Income Tax Reconciliation, Tax Credits, Research		734,000
Possible reduction in liabilities for uncertain tax positions	$ 2,200,000			$ 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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