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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash Flows from Operating Activities      
Net (loss)/ income $ (82,711) $ 207,241 $ 292,668
Adjustments to reconcile net income to net cash provided by operating activities:      
Asset (gain)/impairment (4,082) 100,242 25,026
Depreciation, depletion and amortization 239,086 255,359 239,140
Loss from the early extinguishment of debt 20,184 0 0
Gain on adjustment of environmental reserves 0 0 (10,675)
Share-based compensation expense 22,608 10,607 14,334
Equity in earnings of affiliates, net of tax (10,841) (4,679) (5,171)
Cash dividends from affiliated companies 8,660 6,777 6,620
Net loss/(gain) on disposition of assets 15 (2,752) 746
Net loss on divestiture of business 2,667 14,516 0
Pension and postretirement plan expense 595,620 57,973 52,741
Pension and postretirement plan contributions (163,659) (40,411) (231,234)
Net (decrease)/increase in deferred taxes (158,836) 573 16,958
Change in assets and liabilities, net of effects from acquisitions, divestitures and foreign currency adjustments      
Trade accounts receivable (149,755) 17,853 59,615
Inventories (130,119) 12,125 2,631
Payable to suppliers 172,430 21,487 (25,383)
Prepaid expenses (13,077) 4,754 4,030
Income taxes payable and other income tax items (42,204) (12,545) (6,201)
Accrued expenses and other assets and liabilities (7,314) 56,501 (9,995)
Net cash provided by operating activities 298,672 705,621 425,850
Cash Flows from Investing Activities      
Purchase of property, plant and equipment (256,019) (194,127) (195,934)
Cost of acquisitions, net of cash acquired (22,209) (49,261) (298,380)
Proceeds from the sale of business, net 91,569 103,411 0
Proceeds from the sale of assets 13,166 12,966 14,614
Other net investing activities 7,591 684 603
Net cash used by investing activities (165,902) (126,327) (479,097)
Cash Flows from Financing Activities      
Proceeds from issuance of debt 172,042 1,121,860 276,843
Principal repayment of debt (628,119) (886,055) (139,582)
Net increase/(decrease) in commercial paper borrowings 349,000 (250,000) 130,000
Net increase/(decrease) in outstanding checks 6,974 20,950 (4,486)
Proceeds from interest rate swap 4,387 14,480 0
Payment of contingent consideration 0 (3,000) (5,500)
Cash dividends – common (178,622) (172,626) (170,253)
Dividends paid to noncontrolling interests (1,009) 0 (214)
Excess cash costs of early extinguishment of debt (20,111) 0 0
Payments for share repurchases (218,085) (8,483) (9,608)
Net cash (used)/provided by financing activities (513,543) (162,874) 77,200
Effects of Exchange Rate Changes on Cash (13,097) 3,145 941
(Decrease)/Increase in Cash and Cash Equivalents (393,870) 419,565 24,894
Cash and cash equivalents at beginning of year 564,848 145,283 120,389
Cash and cash equivalents at end of year 170,978 564,848 145,283
Supplemental Schedule of Non-Cash Investing Activities:      
Non-cash additions to property, plant and equipment 27,343 3,139 5,342
Interest paid, net of amounts capitalized 68,189 71,707 66,768
Income taxes paid, net of refunds $ 133,610 $ 65,002 $ 82,512