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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING CASH FLOW      
Net earnings (loss) $ (366,791) $ (1,553,122) $ 232,853
Adjustments to reconcile net earnings (loss) to operating cash flow:      
(Gain) loss on pension settlement (406) 137,898 21,900
Write-off of cumulative translation loss 0 83,665 0
Depreciation 102,451 154,599 197,585
Amortization of intangibles 3,123 15,882 19,071
(Earnings) loss from equity method investments, net of distributions (3,881) 9,348 980
(Gain) loss on sales of assets (510) 7,284 (147,074)
Impairment of Long-Lived Assets Held-for-use 297,604 383,017 0
Amortization of stock-based awards 21,882 36,075 43,029
(Gain) loss on deferred compensation trust (32,792) (55,820) 18,010
(Gain) loss on deferred compensation obligation 34,039 54,490 (22,272)
Deferred taxes (20,285) 320,633 60,709
Net retirement plan accrual (contributions) (20,770) (2,325) (38,372)
Changes in assets and liabilities 29,801 633,027 (227,732)
Other (3,281) (5,633) 3,477
Operating cash flow 185,884 219,018 162,164
INVESTING CASH FLOW      
Purchases of marketable securities (35,078) (31,165) (483,513)
Proceeds from sales and maturities of marketable securities 19,648 238,539 541,104
Capital expenditures (113,442) (180,842) (210,998)
Proceeds from sales of property, plant and equipment 62,692 65,977 81,038
Proceeds from sales of other assets 48,897 0 124,942
Investments in partnerships and joint ventures (29,219) (52,305) (73,145)
Return of capital from partnerships and joint ventures 529 24,065 22,284
Proceeds from company owned life insurance 4,574 16,414 1,040
Other (163) (211) (1,369)
Investing cash flow (41,562) 80,472 1,383
FINANCING CASH FLOW      
Repurchase of common stock 0 0 (50,022)
Dividends paid (28,720) (118,073) (118,734)
Proceeds from issuance of 2028 Notes 0 0 598,722
Repayment of 2021 Notes 0 0 (503,285)
Debt issuance costs 0 0 (5,061)
Distributions paid to NCI (23,184) (33,674) (63,523)
Capital contributions by NCI 110,051 64,646 5,128
Taxes paid on vested restricted stock (1,313) (3,572) (5,686)
Stock options exercised 0 1,466 7,258
Other (12,269) 2,815 (8,523)
Financing cash flow 48,446 (77,299) (140,491)
Effect of exchange rate changes on cash 8,814 10,262 (62,385)
Increase (decrease) in cash and cash equivalents 201,582 232,453 (39,329)
Cash and cash equivalents at beginning of year 1,997,199 1,764,746 1,804,075
Cash and cash equivalents at end of year 2,198,781 1,997,199 1,764,746
Impairment expense - Disc Ops 145,700 0 0
Proceeds from (Repayments of) Other Debt $ 3,881 $ 9,093 $ 3,235