Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net revenues	$ 733,555	$ 751,909	$ 739,818
Cost of sales	653,646	614,071	618,134
Gross profit	79,909	137,838	121,684
Gain on disposition of assets, net	889	0	146
Goodwill impairment	(6,689)	0	0
Selling, general and administrative expenses	(61,084)	(69,841)	(70,287)
Income from operations	13,025	67,997	51,543
Equity in earnings (losses) of investment	216	1,439	(3,918)
Net interest expense	(28,531)	(8,333)	(13,751)
Gain (loss) on extinguishment of long-term debt	9,239	(18)	(1,183)
Other income (expense), net	4,724	1,165	(6,324)
Royalty income and other	2,710	3,306	4,631
Income before income taxes	1,383	65,556	30,998
Income tax provision (benefit)	(18,701)	7,859	2,400
Net income	20,084	57,697	28,598
Net loss attributable to redeemable noncontrolling interests	(2,090)	(222)	0
Net income attributable to common shareholders	$ 22,174	$ 57,919	$ 28,598
Earnings per share of common stock (in dollars per share)
Basic	$ 0.13	$ 0.39	$ 0.19
Diluted	$ 0.13	$ 0.38	$ 0.19
Weighted average common shares outstanding (in shares)
Basic	148,993	147,536	146,702
Diluted	149,897	149,577	146,830