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Quarterly Unaudited Financial Data (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
Quarterly Financial Information Disclosure [Abstract]
Net sales:	$ 240,913	$ 280,086	$ 266,036	$ 215,337	$ 258,112	$ 274,574	$ 247,627	$ 206,605	$ 1,002,372	$ 986,918	$ 1,007,981
Gross profit	53,260	70,279	70,503	48,318	56,729	68,735	61,825	49,255	242,360	236,544	244,762
Income from operations:	18,447	29,404	32,274	13,843	22,547	35,693	24,930	9,679	93,968	92,849	73,488
Interest expense, net	2,759	2,906	3,130	3,269	3,420	3,486	3,550	3,576	12,064	14,032	14,577
Income from continuing operations	13,117	19,503	22,837	8,352	25,176	20,619	13,174	3,996	63,809	62,965	33,719
Loss from discontinued operations					0	0	(405)	0	0	(405)	(44)
Net income	$ 13,117	$ 19,503	$ 22,837	$ 8,352	$ 25,176	$ 20,619	$ 12,769	$ 3,996	$ 63,809	$ 62,560	$ 33,675
(Loss) income per share from continuing operations:
Basic (in dollars per share)	$ 0.41	$ 0.61	$ 0.72	$ 0.26	$ 0.79	$ 0.65	$ 0.41	$ 0.13	$ 2.00	$ 1.98	$ 1.07
Diluted (in dollars per share)	$ 0.40	$ 0.60	$ 0.70	$ 0.26	0.78	0.64	0.41	0.12	1.96	1.95	1.05
Loss per share from discontinued operations:
Basic (in dollars per share)					0.00	0.00	(0.01)	0.00	0.00	(0.01)	0.00
Diluted (in dollars per share)					$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00

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