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Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
$ in Thousands
3 Months Ended
Mar. 26, 2016
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income balance, beginning balance $ 4,761
Other comprehensive income before reclassifications 816
Amounts reclassified from accumulated other comprehensive income (158)
Net current period other comprehensive income 658
Accumulated other comprehensive income balance, ending balance $ 5,419