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
	Jul. 01, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income balance, beginning balance	$ 4,852
Other comprehensive loss before reclassifications	(134)
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive loss	(134)
Accumulated other comprehensive income balance, ending balance	$ 4,718