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Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) (Accumulated Net Unrealized Investment Gain (Loss) [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Accumulated Net Unrealized Investment Gain (Loss) [Member]
 
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income balance, beginning balance $ 4,829us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Other comprehensive income before reclassifications 18us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Amounts reclassified from accumulated other comprehensive income (3)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Net current period other comprehensive income 15us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Accumulated other comprehensive income balance, ending balance $ 4,844us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember