Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 28, 2015

Accumulated Other Comprehensive Income [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

		Unrealized Gains
		on Available-for-Sale
(dollars in thousands)		Marketable Securities
Accumulated other comprehensive income balance as of December 27, 2014	$	4,829
Other comprehensive income before reclassifications		18
Amounts reclassified from accumulated other comprehensive income		(3)
Net current period other comprehensive income		15
Accumulated other comprehensive income balance as of March 28, 2015	$	4,844

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

		Gains (Losses) Reclassified from
		Accumulated Other Comprehensive Income to the
		Consolidated Statements of Income
		13 Weeks Ended
(dollars in thousands)	Location		March 28, 2015		March 29, 2014
Unrealized gains on available-for-sale marketable securities
	Investment income	$	6	$	41
	Provision for income taxes		(3)		(18)
Total amount reclassified, net of tax		$	3	$	23