Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating activities:
Net earnings	$ 1,370,910	$ 2,481,084	$ 1,380,571
Adjustments:
Depreciation	648,911	630,879	635,833
Amortization	85,742	88,758	91,228
Stock-based compensation	90,359	73,422	64,176
Deferred income taxes	99,157	3,017	(221,173)
Distributions from affiliates	37,459	30,196	49,295
Equity in earnings of unconsolidated subsidiaries	(3,311)	(40,240)	(41,661)
Impairment of assets	66,916	110,000
Changes in assets and liabilities (exclusive of acquisitions and dispositions):
Accounts receivable	361,340	(485,433)	(329,501)
Inventories	712,645	(1,092,101)	(900,946)
Accounts payable	(253,457)	235,572	314,817
Federal income taxes	(180,325)	163,743	(107,577)
Salaries, wages and related accruals	(186,755)	204,796	87,700
Other operating activities	(40,178)	(9,741)	32,576
Cash provided by operating activities	2,809,413	2,393,952	1,055,338
Investing activities:
Capital expenditures	(1,477,293)	(982,531)	(448,555)
Investment in and advances to affiliates	(45,834)	(121,412)	(59,000)
Divestiture of affiliates	67,591
Disposition of plant and equipment	41,618	31,589	25,315
Acquisitions (net of cash acquired)	(83,106)	(33,063)	(544,041)
Purchases of investments	(367,741)		(50,000)
Proceeds from the sale of investments	67,701	50,000	150,000
Other investing activities	2,873	25,348	7,389
Cash used in investing activities	(1,794,191)	(1,030,069)	(918,892)
Financing activities:
Net change in short-term debt	4,574	5,037	34,872
Proceeds from long-term debt, net of discount		995,710
Repayment of long-term debt		(500,000)	(600,000)
Bond issuance related costs		(7,625)
Issuance of common stock	16,145	24,101	7,070
Payment of tax withholdings on certain stock-based compensation	(25,047)	(22,123)	(14,408)
Distributions to noncontrolling interests	(76,347)	(56,179)	(90,974)
Cash dividends	(492,062)	(485,376)	(485,321)
Acquisition of treasury stock	(298,541)	(853,997)	(90,304)
Other financing activities	(9,132)	(7,725)	(3,241)
Cash used in financing activities	(880,410)	(908,177)	(1,242,306)
Effect of exchange rate changes on cash	907	(5,924)	9,003
Increase (decrease) in cash and cash equivalents	135,719	449,782	(1,096,857)
Cash and cash equivalents - beginning of year	1,398,886	949,104	2,045,961
Cash and cash equivalents - end of year	1,534,605	1,398,886	949,104
Non-cash investing activity:
Change in accrued plant and equipment purchases	$ 34,777	$ 14,725	$ 58,519