Business Acquisitions (Details 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Business Combinations [Abstract]
Net sales	$ 136,168	$ 274,426
Operating income	26,972	52,954
Net income	$ 15,600	$ 30,474
Basic and diluted net income per common share	$ 0.49	$ 0.97