Costs Associated with Exit and Restructuring Activities - April 2014 Plan (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 28, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 28, 2015 USD ($)	Dec. 31, 2015 employee
April 2014 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 611		$ 611
Restructuring charges
Planned Costs	9,950,000		9,950,000
Actual costs incurred	8,393,000		8,393,000
Elimination of workforce | employee					120
Total restructuring, impairment and restructuring related charges
Restructuring and impairment charges	0	$ 1,733,000	0	$ 2,094,000
April 2014 Plan | Cost of Goods
Restructuring charges
Planned Costs	4,050,000		4,050,000
Actual costs incurred	557,000		557,000
Total restructuring, impairment and restructuring related charges
Restructuring related charges	0	217,000	0	217,000
April 2014 Plan | Operating Earnings
Restructuring charges
Planned Costs	5,900,000		5,900,000
Actual costs incurred	7,836,000		7,836,000
Total restructuring, impairment and restructuring related charges
Restructuring and impairment charges	0	1,516,000	0	1,877,000
April 2014 Plan | Inventory write-down | Cost of Goods
Restructuring charges
Planned Costs	850,000		850,000
Actual costs incurred	0		0
April 2014 Plan | Equipment relocation | Cost of Goods
Restructuring charges
Planned Costs	1,800,000		1,800,000
Actual costs incurred	444,000		444,000
April 2014 Plan | Other charges | Cost of Goods
Restructuring charges
Planned Costs	1,400,000		1,400,000
Actual costs incurred	113,000		113,000
April 2014 Plan | Workforce reduction | Operating Earnings
Restructuring charges
Planned Costs	4,200,000		4,200,000
Actual costs incurred	4,423,000		4,423,000
April 2014 Plan | Asset impairment charge | Operating Earnings
Restructuring charges
Planned Costs	0		0
Actual costs incurred	0		0
April 2014 Plan | Other charges, including pension termination costs | Operating Earnings
Restructuring charges
Planned Costs	1,700,000		1,700,000
Actual costs incurred	$ 3,413,000		$ 3,413,000
April 2014 Plan Amendment
Restructuring charges
Planned Costs		4,250,000		4,250,000
April 2014 Plan Amendment | Equipment relocation
Restructuring charges
Planned Costs		2,950,000		2,950,000
April 2014 Plan Amendment | General and administrative expense
Restructuring charges
Planned Costs		$ 1,300,000		$ 1,300,000