Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 64,025	$ 108,966
Accounts receivable, net (Note 6)	181,658	199,284
Inventory (Note 7)	251,180	304,028
Prepaid and other current assets	76,964	61,314
Assets of discontinued operations (Note 3)	0	42,500
Total current assets	573,827	716,092
Property, Plant and Equipment, Net (Note 8)	1,316,055	1,363,557
Deferred Tax Assets (Note 20)	384,513	375,471
Intangible Assets, Net	45,451	52,460
Other Assets	160,301	120,299
Assets of discontinued operations (Note 3)	0	51,207
Total Assets	2,480,147	2,679,086
Current Liabilities
Accounts payable	153,181	181,705
Accrued and other current liabilities (Note 9)	102,178	146,155
Current maturities of long-term debt (Note 10)	19,448	15,012
Current environmental liabilities (Note 11)	11,339	11,310
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	16,236
Total current liabilities	286,146	370,418
Long-Term Debt (Note 10)	1,062,695	1,173,157
Non-Current Environmental Liabilities (Note 11)	160,037	149,344
Pension and Other Postretirement Benefits (Note 18)	236,625	233,658
Deferred Tax Liabilities (Note 20)	24,847	28,016
Other Non-Current Liabilities	26,999	12,074
Liabilities of discontinued operations (Note 3)	0	5,548
Commitments and Contingencies (Note 22)
Stockholders’ Equity (Note 14)
Preferred stock, 0 and 10,000,000 shares authorized at $0.00 and $0.01 par value, 0 and 1,725,000 issued and outstanding as of December 31, 2019 and December 31, 2018, respectively, aggregate liquidation preference $0 and $172,500	0	17
Common stock, 140,000,000 shares authorized at $0.01 par value, 63,136,129 and 49,291,130 issued and outstanding, as of December 31, 2019 and 2018, respectively	632	493
Additional paid-in capital	399,020	399,490
Retained earnings	422,373	462,568
Accumulated other comprehensive income (loss) (Note 15)	(139,227)	(155,697)
Total Stockholders’ Equity	682,798	706,871
Total Liabilities and Stockholders’ Equity	$ 2,480,147	$ 2,679,086