- Summary of Unaudited Consolidated Results of Operations, Including Proforma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
As Reported
Net sales	$ 258,004	$ 243,975	$ 218,371	$ 243,525	$ 257,922	$ 243,049	$ 255,532	$ 238,349	$ 963,875	$ 994,852	$ 882,753
Net income	$ 15,378	$ (3,009)	$ (19,058)	$ (3,154)	$ (4,205)	$ (3,398)	$ 6,859	$ 6,195	$ (9,843)	$ 5,451	$ 42,017
Basic (in dollars per share)	$ 0.28	$ (0.05)	$ (0.34)	$ (0.06)	$ (0.08)	$ (0.06)	$ 0.12	$ 0.11	$ (0.18)	$ 0.10	$ 0.80
Diluted (in dollars per share)	$ 0.27	$ (0.05)	$ (0.34)	$ (0.06)	$ (0.08)	$ (0.06)	$ 0.12	$ 0.11	$ (0.18)	$ 0.10	$ 0.78
Pro Forma
Net sales											$ 928,336
Net income											$ 20,699
Basic, Pro Forma (in dollars per share)											$ 0.40
Diluted, Pro Forma (in dollars per share)											$ 0.38