CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net earnings	$ 476,569	$ 391,783
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	278,925	256,463
Noncash operating lease expense	26,349	0
Net gain on sale of property, plant & equipment and businesses	(10,982)	(8,374)
Contributions to pension plans	(6,767)	(107,202)
Share-based compensation expense	24,815	21,650
Deferred tax expense (benefit)	62,232	76,779
Cost of debt purchase	0	6,922
Changes in assets and liabilities before initial effects of business acquisitions and dispositions	(221,001)	(67,836)
Other, net	15,989	2,446
Net cash provided by operating activities	646,129	572,631
Investing Activities
Purchases of property, plant & equipment	(306,893)	(348,238)
Proceeds from sale of property, plant & equipment	12,112	12,838
Proceeds from sale of businesses	1,744	11,256
Payment for businesses acquired, net of acquired cash	1,122	(213,138)
Other, net	(11,342)	(12,216)
Net cash used for investing activities	(303,257)	(549,498)
Financing Activities
Proceeds from short-term debt	366,900	514,900
Payment of short-term debt	(499,900)	(314,900)
Payment of current maturities and long-term debt	(17)	(892,049)
Proceeds from issuance of long-term debt	0	850,000
Debt issuance and exchange costs	0	(45,513)
Settlements of interest rate derivatives	0	3,378
Purchases of common stock	(2,602)	(99,916)
Dividends paid	(122,943)	(111,192)
Share-based compensation, shares withheld for taxes	(37,612)	(31,418)
Net cash used for financing activities	(296,174)	(126,710)
Net increase (decrease) in cash and cash equivalents and restricted cash	46,698	(103,577)
Cash and cash equivalents and restricted cash at beginning of year	44,404	146,646
Cash and cash equivalents and restricted cash at end of period	$ 91,102	$ 43,069