Quarterly Unaudited Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales:	$ 258,131	$ 299,236	$ 262,655	$ 227,417	$ 240,913	$ 280,086	$ 266,036	$ 215,337	$ 1,047,439	$ 1,002,372	$ 986,918
Gross profit	60,855	76,578	63,558	43,900	53,260	70,279	70,503	48,318	244,891	242,360	236,544
Income from operations:	19,247	31,420	26,606	10,566	18,447	29,404	32,274	13,843	87,839	93,968	92,849
Interest expense, net	(92)	17	219	2,061	2,759	2,906	3,130	3,269	2,205	12,064	14,032
Income from continuing operations	14,357	24,476	19,913	6,345	13,117	19,503	22,837	8,352	65,091	63,809	62,965
Net income	$ 14,357	$ 24,476	$ 19,913	$ 6,345	$ 13,117	$ 19,503	$ 22,837	$ 8,352	$ 65,091	$ 63,809	$ 62,560
(Loss) income per share from continuing operations:
Basic (in dollars per share)	$ 0.44	$ 0.75	$ 0.62	$ 0.20	$ 0.41	$ 0.61	$ 0.72	$ 0.26	$ 2.01	$ 2.00	$ 1.98
Diluted (in dollars per share)	$ 0.44	$ 0.75	$ 0.61	$ 0.19	$ 0.40	$ 0.60	$ 0.70	$ 0.26	$ 1.99	$ 1.96	$ 1.95