Acquisitions - Summary of Unaudited Consolidated Results of Operations, Including Proforma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
As Reported
Net sales	$ 221,659	$ 179,337	$ 649,504	$ 536,955
Net income	$ 16,619	$ (3,569)	$ 32,828	$ 20,717
Basic (in dollars per share)	$ 0.31	$ (0.07)	$ 0.64	$ 0.43
Diluted (in dollars per share)	$ 0.30	$ (0.07)	$ 0.62	$ 0.42
Pro Forma
Net sales				$ 539,715
Net income				$ 10,039
Basic (in dollars per share)				$ 0.21
Diluted (in dollars per share)				$ 0.20