Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 1,546,800	$ 1,136,400	$ 1,476,400
Cost of sales	1,160,200	844,100	1,086,700
Gross profit	386,600	292,300	389,700
Selling, general and administrative expenses	210,400	176,100	206,900
Research and development costs	22,000	20,200	19,900
Gain related to litigation settlement	(82,900)	0	0
Other expenses, net	8,600	21,600	15,700
Income from operations	228,500	74,400	147,200
Interest and other financial expense, net	38,000	38,700	27,600
Reclassification of actuarial losses from AOCI	4,800	9,900	0
Income before earnings in affiliated companies and income taxes	185,700	25,800	119,600
Income tax expense	51,700	8,100	33,300
Earnings in affiliated companies, net of tax	700	500	600
Net income	$ 134,700	$ 18,200	$ 86,900
Weighted-average shares outstanding (in thousands of shares):
Basic (in shares)	60,708	60,430	59,986
Diluted (in shares)	60,951	61,407	61,300
Earnings per share
Basic (in USD per share)	$ 2.22	$ 0.30	$ 1.45
Diluted (in USD per share)	$ 2.21	$ 0.30	$ 1.42