Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Sales	$ 1,407,558	$ 1,343,834	$ 1,430,948
Cost of Sales	(1,332,836)	(1,280,405)	(1,377,483)
Gross Margin	74,722	63,429	53,465
Selling, general and administrative expenses	(75,789)	(77,942)	(80,775)
Foreign exchange gains (losses)	875	(5,677)	(3,209)
Other operating expense, net (Note 18)	(10,253)	(10,175)	(21,964)
Operating Loss	(10,445)	(30,365)	(52,483)
Interest expense	(66,394)	(55,517)	(52,001)
Interest income (loss) and other, net	785	(7,064)	175
Other components of net periodic benefit income (expense)	(4,337)	2,559	(24)
Unrealized loss on GreenFirst equity securities	(3,597)	0	0
Gain (loss) on debt extinguishment	1,116	(7,841)	0
Loss from Continuing Operations Before Income Taxes	(82,872)	(98,228)	(104,333)
Income tax benefit (Note 19)	34,688	60,890	20,386
Equity in loss of equity method investment	(1,585)	(731)	0
Loss from Continuing Operations	(49,769)	(38,069)	(83,947)
Income from discontinued operations (Note 3)	116,183	38,624	61,497
Net Income (Loss) Attributable to the Company	66,414	555	(22,450)
Mandatory convertible stock dividends	0	0	(8,582)
Net income (loss) available for common stockholders	$ 66,414	$ 555	$ (31,032)
Basic Earnings (Loss) Per Share of Common Stock (Note 15)
Income (loss) from continuing operations (in dollars per share)	$ (0.78)	$ (0.60)	$ (1.70)
Income from discontinued operations (in dollars per share)	1.83	0.61	1.13
Net income (loss) per common share-basic (in dollars per share)	1.05	0.01	(0.57)
Diluted Earnings (Loss) Per Share of Common Stock (Note 15)
Income (loss) from continuing operations (in dollars per share)	(0.78)	(0.60)	(1.70)
Income from discontinued operations (in dollars per share)	1.83	0.61	1.13
Net income (loss) per common share-diluted (in dollars per share)	$ 1.05	$ 0.01	$ (0.57)
Comprehensive Income:
Net Income (Loss) Attributable to the Company	$ 66,414	$ 555	$ (22,450)
Other Comprehensive Income (Loss), net of tax (Note 14)
Foreign currency translation adjustments	(17,919)	25,024	(5,394)
Unrealized gain (loss) on derivative instruments	(2,681)	544	12,912
Net gain (loss) from pension and postretirement plans	69,765	(19,976)	8,952
Total other comprehensive income (loss)	49,165	5,592	16,470
Comprehensive Income (Loss)	$ 115,579	$ 6,147	$ (5,980)