CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ (1,366,333)	$ 215,128
Adjustments to reconcile net earnings (loss) to cash provided (utilized) by operating activities:
Depreciation of fixed assets	129,014	150,592
Amortization of intangibles	13,032	14,327
(Earnings) loss from equity method investments, net of distributions	6,510	506
Gain on sale of joint venture interest	0	(124,942)
Loss (gain) on sale of property, plant and equipment	5,690	(15,595)
Impairment of long-lived assets	347,411	0
Amortization of stock-based awards	27,513	34,735
Deferred compensation trust	(36,989)	(14,915)
Deferred compensation obligation	34,827	19,320
Deferred taxes	270,996	30,969
Net retirement plan accrual (contributions)	(1,821)	(16,552)
Changes in operating assets and liabilities	627,009	(305,467)
Other items	10,039	609
Cash provided (utilized) by operating activities	66,898	(11,285)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of marketable securities	(31,165)	(317,747)
Proceeds from the sales and maturities of marketable securities	197,923	347,131
Capital expenditures	(140,058)	(148,671)
Proceeds from disposal of property, plant and equipment	56,431	60,863
Investments in partnerships and joint ventures	(34,502)	(33,799)
Return of capital from partnerships and joint ventures	11,733	20,484
Other items	2,071	(1,041)
Cash provided (utilized) by investing activities	74,678	(71,740)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(88,708)	(89,193)
Proceeds from issuance of 4.250% Senior Notes	0	598,722
Repayment of 3.375% Senior Notes	0	(503,285)
Net proceeds from issuance of commercial paper	0	24,449
Debt issuance costs	0	(4,974)
Distributions paid to noncontrolling interests	(26,123)	(34,688)
Capital contributions by noncontrolling interests	10,581	4,293
Taxes paid on vested restricted stock	(3,572)	(5,686)
Stock options exercised	1,466	7,170
Other items	(1,990)	(9,737)
Cash utilized by financing activities	(87,140)	(8,374)
Effect of exchange rate changes on cash	(14,078)	(32,880)
Cash and cash equivalents at end of period	1,805,104
Increase (decrease) in cash and cash equivalents	40,358	(124,279)
Cash and cash equivalents at beginning of period	1,764,746	1,804,075
Cash and cash equivalents at end of period	$ 1,805,104	$ 1,679,796