Business Combinations - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 27, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 27, 2015
Business Acquisition
Net sales	$ 99,697	$ 90,646		$ 295,095	$ 289,028
Net earnings	$ 3,720	$ (4,760)		$ 26,070	$ 20,607
CTG Advanced
Business Acquisition
Net sales			$ 7,096
Net earnings			$ 256