Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income (loss)	$ (22,450)	$ 128,416	$ 324,964
Loss (income) from discontinued operations	(96,158)	(28,965)	(1,537)
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	153,275	145,957	96,646
Stock-based incentive compensation expense	6,531	13,007	8,986
Amortization of capitalized debt costs and debt discount	2,292	835	3,377
Deferred income tax (benefit) expense	(25,552)	7,637	29,782
Gain on bargain purchase	0	(19,071)	(316,555)
Increase in environmental liabilities	16,384	7,285	256
Net periodic benefit cost of pension and postretirement plans	16,580	5,063	10,264
Loss from sale/disposal of property, plant and equipment	1,295	3,186	2,032
Loss (gain) on foreign currency exchange	6,574	(12,170)	(2,335)
Other	(3,332)	3,390	1,304
Changes in operating assets and liabilities:
Receivables	14,443	(31,532)	(2,574)
Inventories	52,347	(21,579)	(651)
Accounts payable	(26,025)	30,162	17,629
Accrued liabilities	(20,034)	4,864	(4,299)
All other operating activities	(36,074)	9,597	(18,838)
Payments for pension and other postretirement benefit plans	(11,593)	(12,153)	(13,763)
Expenditures for environmental liabilities	(6,444)	(11,852)	(5,795)
Cash provided by operating activities-continuing operations	22,059	222,077	126,285
Cash provided by operating activities-discontinued operations	19,845	24,867	3,487
Cash Provided by Operating Activities	41,904	246,944	129,772
Investing Activities
Acquisition of Tembec, net of cash acquired	0	0	(210,164)
Capital expenditures	(102,807)	(128,786)	(74,955)
Proceeds from sale of resins operations	0	16,233	0
Realized gain on derivative instrument	0	0	7,780
Cash used for investing activities-continuing operations	(102,807)	(112,553)	(277,339)
Cash provided by (used for) investing activities-discontinued operations	155,309	(3,413)	(87)
Cash Used for Investing Activities	52,502	(115,966)	(277,426)
Financing Activities
Revolving credit facility and other borrowings	91,158	0	680,000
Repayments of revolving credit facility	(86,000)	0	0
Repayment of debt	(114,331)	(45,270)	(729,958)
Dividends paid on common stock	(8,569)	(15,058)	(12,693)
Dividends paid on preferred stock	(10,350)	(13,800)	(13,800)
Proceeds from the issuance of common stock	0	451	14
Repurchase of common stock	(6,878)	(42,780)	(157)
Debt issuance costs	(3,514)	0	(7,025)
Cash (Used for) Provided by Financing Activities	(138,484)	(116,457)	(83,619)
Change in cash and cash equivalents	(44,078)	14,521	(231,273)
Net effect of foreign exchange on cash and cash equivalents	(863)	(1,790)	853
Balance, beginning of year	108,966	96,235	326,655
Balance, end of year	$ 64,025	$ 108,966	$ 96,235