Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 330,876	$ 291,858
Cost of goods sold	272,134	250,053
Gross profit	58,742	41,805
Selling, general & administrative expenses	(54,240)	(51,391)
Impairment and exit charges	(824)	(231)
Other operating income, net	330	579
Operating expenses	(54,734)	(51,043)
Income (loss) from operations	4,008	(9,238)
Other income (expense)
Interest expense	(20,745)	(24,665)
Loss on extinguishment of debt	(50)	0
Earnings from equity method investee	2,799	1,567
Loss before income taxes	(13,988)	(32,336)
Income tax (expense) benefit	(78)	7,297
Net loss	$ (14,066)	$ (25,039)
Loss per share:
Basic and diluted (in shares)	$ (0.22)	$ (0.39)
Weighted average common shares outstanding:
Basic and diluted (in dollars per share)	64,804	64,004