Basis of Presentation (Reclassification) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Prior Period Adjustments Restatement [Line Items]
Net sales	$ 329,511	$ 353,817	$ 382,675	$ 1,010,850	$ 1,162,903
Cost of sales	$ 277,588	292,389	314,783	$ 840,996	965,553
Previously Reported [Member]
Prior Period Adjustments Restatement [Line Items]
Net sales		346,410	376,575		1,142,973
Cost of sales		284,982	308,683		945,623
Reclassification Adjustment [Member]
Prior Period Adjustments Restatement [Line Items]
Net sales		7,407	6,100		19,930
Cost of sales		$ 7,407	$ 6,100		$ 19,930