Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] $ in Thousands	6 Months Ended
	Jun. 27, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income balance, beginning balance	$ 4,829
Other comprehensive loss before reclassifications	(109)
Amounts reclassified from accumulated other comprehensive income	(8)
Net current period other comprehensive loss	(117)
Accumulated other comprehensive income balance, ending balance	$ 4,712