Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net revenues	$ 751,909	$ 739,818	$ 581,383
Cost of sales	614,071	618,134	519,217
Gross profit	137,838	121,684	62,166
Gain (loss) on disposition of assets, net	0	146	(39)
Selling, general and administrative expenses	(69,841)	(70,287)	(63,257)
Income (loss) from operations	67,997	51,543	(1,130)
Equity in earnings (losses) of investment	1,439	(3,918)	(2,368)
Net interest expense	(8,333)	(13,751)	(18,778)
Loss on extinguishment of long-term debt	(18)	(1,183)	(397)
Other income (expense), net	1,165	(6,324)	(1,434)
Royalty income and other	3,306	4,631	3,735
Income (loss) before income taxes	65,556	30,998	(20,372)
Income tax provision (benefit)	7,859	2,400	(50,424)
Net income	57,697	28,598	30,052
Net loss attributable to redeemable noncontrolling interests	(222)	0	0
Net income attributable to common shareholders	$ 57,919	$ 28,598	$ 30,052
Earnings (loss) per share of common stock (in dollars per share)
Basic	$ 0.39	$ 0.19	$ 0.20
Diluted	$ 0.38	$ 0.19	$ 0.20
Weighted average common shares outstanding (in shares)
Basic	147,536	146,702	145,295
Diluted	149,577	146,830	145,300