Quarterly Results of Operations Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information [Table Text Block]

The following is a summary of the results of operations for each quarter of 2016 and 2015.

	Fiscal 2016, Three Months Ended
	Apr 2			July 2		Oct 1		Dec 31
Revenues	$	180,833		$	224,763	$	223,719	$	216,363
Gross profit (revenues less costs and expenses, operating)	57,660			87,631		81,386		77,515
Income (loss) from operations	(5,120		)	24,286		15,042		11,163
Net income (loss)	(4,188		)	13,309		8,141		5,022
Net income (loss) per share -- Basic	$	(.33	)	$	1.03	$	.63	$	.37
Net income (loss) per share -- Diluted	$	(.33	)	$	1.00	$	.61	$	.36
ESOT valuation per share	$	32.70		$	32.70	$	33.90	$	35.20

	Fiscal 2015, Three Months Ended
	Apr 4			Jul 4		Oct 3		Dec 31
Revenues	$	174,292		$	224,773	$	224,981	$	197,858
Gross profit (revenues less costs and expenses, operating)	54,434			87,432		81,808		69,331
Income (loss) from operations	(3,985		)	27,796		16,177		4,120
Net income (loss)	(3,528		)	15,932		8,174		1,220
Net income (loss) per share -- Basic	$	(.27	)	$	1.21	$	.58	$	.10
Net income (loss) per share -- Diluted	$	(.27	)	$	1.17	$	.55	$	.11
ESOT valuation per share	$	30.10		$	30.10	$	31.50	$	32.70
Fourth quarters 2016 and 2015 include a decrease in casualty insurance expense that had the effect of increasing the fourth quarter gross profit for 2016 and 2015 by approximately $2,810 and $2,589, respectively.