Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Sales	$ 1,775,392	$ 1,956,994	$ 940,416
Cost of Sales	(1,721,235)	(1,665,847)	(799,663)
Gross Margin	54,157	291,147	140,753
Selling, general and administrative expenses	(89,644)	(104,989)	(79,560)
Duties	(22,634)	(25,921)	(939)
Other operating expense, net (Note 19)	(24,997)	(12,422)	(1,274)
Operating Income (Loss)	(83,118)	147,815	58,980
Interest expense	(60,267)	(55,923)	(39,967)
Interest income and other, net	(24)	5,019	2,352
Other components of net periodic benefit income (expense)	(4,875)	8,345	(3,040)
Gain on bargain purchase (Note 4)	0	20,449	316,555
Gain on derivative instrument	0	0	7,780
Gain on debt extinguishment	0	786	0
Income (Loss) from Continuing Operations Before Income Taxes	(148,284)	126,491	342,660
Income tax benefit (expense) (Note 20)	29,676	(27,040)	(19,233)
Income (Loss) from Continuing Operations	(118,608)	99,451	323,427
Income from discontinued operations (Note 3)	96,158	28,965	1,537
Net Income (Loss) Attributable to the Company	(22,450)	128,416	324,964
Mandatory convertible stock dividends	(8,582)	(13,800)	(13,800)
Net income (loss) available for common stockholders	$ (31,032)	$ 114,616	$ 311,164
Basic Earnings (Loss) Per Share of Common Stock (Note 16)
Income (loss) from continuing operations (in dollars per share)	$ (2.33)	$ 1.70	$ 7.13
Income from discontinued operations (in dollars per share)	1.76	0.57	0.04
Net income (loss) per common share-Basic (in dollars per share)	(0.57)	2.27	7.17
Diluted Earnings (Loss) Per Share of Common Stock (Note 16)
Income (loss) from continuing operations (in dollars per share)	(2.33)	1.52	5.78
Income from discontinued operations (in dollars per share)	1.76	0.44	0.03
Net income (loss) per common share-Diluted (in dollars per share)	$ (0.57)	$ 1.96	$ 5.81
Comprehensive Income:
Net Income (Loss) Attributable to the Company	$ (22,450)	$ 128,416	$ 324,964
Other Comprehensive Income (Loss), net of tax (Note 15)
Foreign currency translation adjustments	(5,394)	(13,353)	4,868
Unrealized gain (loss) on derivative instruments	12,912	(12,241)	619
Net gain (loss) from pension and postretirement plans	8,952	(31,527)	28,442
Total other comprehensive income (loss)	16,470	(57,121)	33,929
Comprehensive Income (Loss)	$ (5,980)	$ 71,295	$ 358,893