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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected quarterly financial data [Abstract]
Net sales	$ 208,968	$ 210,547	$ 198,775	$ 199,442	$ 214,962	$ 207,647	$ 196,829	$ 200,427	$ 817,733	$ 819,866	$ 821,571
Gross profit	114,466	115,372	107,797	108,907	116,193	112,015	107,119	109,596	446,542	444,923	443,337
Income before taxes	12,338	11,204	8,410	8,457	14,070	9,719	9,694	9,740	40,408	43,223	45,821
Net income	$ 9,429	$ 8,352	$ 6,214	$ 6,313	2,921	$ 5,983	$ 6,185	$ 5,986	30,307	$ 21,075	$ 28,356
Diluted net earnings per share [Abstract]
Other income					1,900
Insurance recoveries					1,300
Additional provision for income tax expense					$ 5,900				$ 5,868
Common Stock [Member]
Basic net earnings per share [Abstract]
Common stock (in dollars per share)	$ 0.46	$ 0.40	$ 0.30	$ 0.30	$ 0.14	$ 0.28	$ 0.29	$ 0.28	$ 1.45	$ 1.00	$ 1.32
Diluted net earnings per share [Abstract]
Common stock (in dollars per share)	0.45	0.39	0.29	0.29	0.13	0.28	0.29	0.28	1.42	0.98	1.30
Class A Common Stock [Member]
Basic net earnings per share [Abstract]
Common stock (in dollars per share)	0.44	0.38	0.28	0.28	0.13	0.27	0.28	0.27	1.39	0.95	1.27
Diluted net earnings per share [Abstract]
Common stock (in dollars per share)	$ 0.45	$ 0.38	$ 0.28	$ 0.28	$ 0.13	$ 0.27	$ 0.27	$ 0.27	$ 1.39	$ 0.94	$ 1.27

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