Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] $ in Thousands	9 Months Ended
	Sep. 24, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income balance, beginning balance	$ 4,761
Other comprehensive income before reclassifications	1,019
Amounts reclassified from accumulated other comprehensive income	(257)
Net current period other comprehensive income	762
Accumulated other comprehensive income balance, ending balance	$ 5,523