Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 29, 2014

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 28, 2013	$	3,939
Other comprehensive gain before reclassifications		933
Amounts reclassified from accumulated other comprehensive income		(23)
Net current period other comprehensive gain		910
Accumulated other comprehensive income balance as of March 29, 2014	$	4,849

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 29, 2014		March 30, 2013
Unrealized gains on available-for-sale marketable securities
	Investment income	$	41	$	47
	Provision for income taxes		(18)		(21)
Total amount reclassified, net of tax		$	23	$	26