Stockholders' Equity (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Amounts Reclassified from AOCI
Interest expense	$ (745)us-gaap_InterestExpense	$ (798)us-gaap_InterestExpense
Interest income	192us-gaap_InvestmentIncomeInterest	302us-gaap_InvestmentIncomeInterest
Income before income taxes	7,067	9,580
Income tax benefit	(689)us-gaap_IncomeTaxExpenseBenefit	(1,470)us-gaap_IncomeTaxExpenseBenefit
Net income	6,378	8,110
Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Income before income taxes	(140)	(143)
Income tax benefit	49	50
Net income	(91)	(93)
Unrealized Gain on Cash Flow Hedge \| Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest expense	(130)	(143)
Net Unrealized Losses on Available-For-Sale Securities \| Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest income	$ (10)

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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