Summary Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 769,970	$ 723,530	$ 705,030
Gross Profit	182,080	193,900	200,110
Income (loss) from continuing operations	(79,760)	61,940	73,710
Income from discontinued operations, net of income taxes	0	36,680	9,590
Net income (loss)	$ (79,760)	$ 98,620	$ 83,300
Basic earnings (loss) per share:
Continuing operations	$ (1.83)	$ 1.37	$ 1.61
Discontinued operations	0	0.81	0.21
Net income (loss) per share	$ (1.83)	$ 2.18	$ 1.82
Weighted average shares—basic	43,581,232	45,303,659	45,824,555
Diluted earnings (loss) per share:
Continuing operations	$ (1.83)	$ 1.36	$ 1.60
Discontinued operations	0	0.80	0.20
Net income (loss) per share	$ (1.83)	$ 2.16	$ 1.80
Weighted average shares—diluted	43,581,232	45,595,154	46,170,464