CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net earnings	$ 617,662	$ 515,805	$ 601,185
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	374,596	346,246	305,965
Noncash operating lease expense	35,344	0	0
Net gain on sale of property, plant & equipment and businesses	(23,752)	(14,944)	(17,827)
Contributions to pension plans	(8,882)	(109,631)	(20,023)
Share-based compensation expense	31,843	25,215	26,635
Deferred tax expense (benefit)	76,011	64,639	(235,697)
Cost of debt purchase	0	6,922	140,772
(Increase) decrease in assets excluding the initial effects of business acquisitions and dispositions
Accounts and notes receivable	(29,734)	63,230	(81,561)
Inventories	(28,273)	(34,976)	(14,121)
Prepaid expenses	5,990	(2,167)	(28,445)
Other assets	(61,195)	(58,489)	(23,759)
Increase (decrease) in liabilities excluding the initial effects of business acquisitions and dispositions
Accrued interest and income taxes	(4,644)	12,148	1,303
Trade payables and other accruals	21,788	40,181	9,823
Other noncurrent liabilities	(51,150)	(26,901)	(32,592)
Other, net	28,518	5,499	13,020
Net cash provided by operating activities	984,122	832,777	644,678
Investing Activities
Purchases of property, plant & equipment	(384,094)	(469,088)	(459,566)
Proceeds from sale of property, plant & equipment	22,661	22,210	15,756
Proceeds from sale of businesses	1,744	11,256	287,292
Payment for businesses acquired, net of acquired cash	(44,151)	(221,419)	(1,109,725)
Other, net	(11,997)	(12,850)	(3,248)
Net cash used for investing activities	(415,837)	(669,891)	(1,269,491)
Financing Activities
Proceeds from short-term debt	366,900	739,900	5,000
Payment of short-term debt	(499,900)	(606,900)	(5,000)
Payment of current maturities and long-term debt	(23)	(892,055)	(1,463,308)
Proceeds from issuance of long-term debt	0	850,000	2,200,000
Debt issuance and exchange costs	0	(45,513)	(15,291)
Settlements of interest rate derivatives	0	3,378	0
Purchases of common stock	(2,602)	(133,983)	(60,303)
Dividends paid	(163,973)	(148,109)	(132,335)
Share-based compensation, shares withheld for taxes	(38,585)	(31,846)	(25,323)
Net cash provided by (used for) financing activities	(338,183)	(265,128)	503,440
Net increase (decrease) in cash and cash equivalents and restricted cash	230,102	(102,242)	(121,373)
Cash and cash equivalents and restricted cash at beginning of year	44,404	146,646	268,019
Cash and cash equivalents and restricted cash at end of year	$ 274,506	$ 44,404	$ 146,646