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Selected Quarterly Financial Data (Details) - USD ($) $ in Thousands	3 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
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 192,524	$ 184,370	$ 186,260	$ 192,136	$ 198,313	$ 205,968	$ 214,095	$ 207,948
Gross profit	42,305	41,909	46,331	40,092	37,951	38,892	44,375	34,986
Income (loss) from continuing operations	6,475	(16,976)	14,332	(20,663)	990	15,052	19,871	22,548
Net income (loss)	$ 895	$ (65,213)	$ 11,196	$ (22,321)	$ (3,136)	$ 17,133	$ 14,477	$ 19,785
Basic:
Continuing operations	$ 0.19	$ (0.51)	$ 0.43	$ (0.62)	$ 0.03	$ 0.45	$ 0.60	$ 0.68
Discontinued operations	(0.17)	(1.44)	(0.10)	(0.05)	(0.12)	0.06	(0.16)	(0.08)
Basic	0.02	(1.95)	0.33	(0.67)	(0.09)	0.51	0.44	0.60
Diluted:
Continuing operations (in usd per share)	0.19	(0.51)	0.43	(0.62)	0.03	0.45	0.60	0.68
Discontinued operations (in usd per share)	(0.17)	(1.44)	(0.10)	(0.05)	(0.12)	0.06	(0.16)	(0.08)
Net income (in usd per share)	$ 0.02	$ (1.95)	$ 0.33	$ (0.67)	$ (0.09)	$ 0.51	$ 0.44	$ 0.60
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	$ (5,580)	$ (48,237)	$ (3,136)	$ (1,658)	$ (4,126)	$ 2,081	$ (5,394)	$ (2,763)

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