Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016	Dec. 25, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales as reported	$ 240,628	$ 182,709	$ 414,848	$ 368,774
(Loss) Income from operations	(1,998)	19,540	1,946	38,262
Property, plant and equipment, net	501,607		501,607		$ 227,403
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales as reported	186,898	182,709	361,118	368,774
(Loss) Income from operations	(1,098)	19,540	2,846	38,262
Property, plant and equipment, net	247,930		247,930		227,403
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales as reported	53,730	0	53,730	0
(Loss) Income from operations	(900)	$ 0	(900)	$ 0
Property, plant and equipment, net	$ 253,677		$ 253,677		$ 0