Summary of Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2016

Summary of Quarterly Results [Abstract]

Quarterly Financial Information [Table Text Block]

(dollars in thousands, except per share amounts)	Thirteen Weeks Ended						Fourteen Weeks Ended
	March 26, 2016		June 25, 2016		September 24, 2016		December 31, 2016
Net sales	$	738,204	$	730,433	$	742,986	$	925,097
Gross profit on sales		207,112		201,938		204,864		258,241
Gain on bargain purchase		-		-		-		23,879
Net income		20,129		15,265		10,628		41,140
Basic and diluted earnings per share	$	.75	$	.57	$	.40	$	1.52

(dollars in thousands, except per share amounts)	Thirteen Weeks Ended
	March 28, 2015		June 27, 2015		September 26, 2015		December 26, 2015
Net sales	$	712,426	$	718,380	$	711,879	$	734,063
Gross profit on sales		195,115		198,919		194,147		198,551
Net income		13,323		16,644		12,788		16,575
Basic and diluted earnings per share	$	.50	$	.62	$	.48	$	.61