Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 27, 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 29, 2012	$	5,019
Other comprehensive loss before reclassifications		(36)
Amounts reclassified from accumulated other comprehensive income		(1,044)
Net current period other comprehensive loss		(1,080)
Accumulated other comprehensive income balance as of December 28, 2013	$	3,939
Other comprehensive income before reclassifications		927
Amounts reclassified from accumulated other comprehensive income		(37)
Net current period other comprehensive income		890
Accumulated other comprehensive income balance as of December 27, 2014	$	4,829

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

		Gains (Losses) Reclassified from
		Accumulated Other Comprehensive Income to the
		Consolidated Statements of Income
(dollars in thousands)	Location		2014		2013		2012
Unrealized gains on available-for-sale marketable securities
	Investment income	$	63	$	1,774	$	713
	Provision for income taxes		(26)		(730)		(293)
Total amount reclassified, net of tax		$	37	$	1,044	$	420