Quarterly Results of Operations (Unaudited) (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
Selected Quarterly Financial Information [Abstract]
Net sales	$ 514,841	$ 564,906	$ 559,911	$ 514,872	$ 516,159	$ 542,273	$ 522,219	$ 463,661	$ 2,154,530	$ 2,044,312
Gross profit	160,317	171,795	171,537	152,960	155,618	154,037	146,267	134,437	656,609	590,359
Income from continuing operations	$ 9,570	$ 12,709	$ 14,721	$ 4,828	$ 1,925	$ (37,553)	$ 1,473	$ (2,264)	$ 41,828	$ (36,419)
Earnings (loss) from continuing operations basic (in dollars per share)	$ 0.22	$ 0.30	$ 0.34	$ 0.11	$ 0.04	$ (0.88)	$ 0.03	$ (0.05)	$ 0.94	$ (0.28)
Earnings (loss) from continuing operations - diluted (in dollars per share)	$ 0.22	$ 0.30	$ 0.34	$ 0.11	$ 0.04	$ (0.88)	$ 0.03	$ (0.05)	$ 0.93	$ (0.28)