CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net earnings	$ 260,857	$ 212,631
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	182,677	167,072
Net gain on sale of property, plant & equipment and businesses	(10,748)	(6,270)
Contributions to pension plans	(4,638)	(104,794)
Share-based compensation expense	14,370	14,763
Deferred tax expense (benefit)	34,816	40,549
Cost of debt purchase	0	6,922
Changes in assets and liabilities before initial effects of business acquisitions and dispositions	(201,256)	(55,415)
Other, net	25,838	302
Net cash provided by operating activities	301,916	275,760
Investing Activities
Purchases of property, plant & equipment	(225,837)	(247,166)
Proceeds from sale of property, plant & equipment	11,200	8,523
Proceeds from sale of businesses	1,744	11,256
Payment for businesses acquired, net of acquired cash	1,122	(218,996)
Other, net	(4,577)	(10,226)
Net cash used for investing activities	(216,348)	(456,609)
Financing Activities
Proceeds from short-term debt	360,100	506,200
Payment of short-term debt	(356,100)	(146,200)
Payment of current maturities and long-term debt	(11)	(892,044)
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	0	(74,921)
Dividends paid	(81,927)	(74,196)
Share-based compensation, shares withheld for taxes	(25,512)	(31,386)
Net cash (used for) provided by financing activities	(103,450)	95,318
Net decrease in cash and cash equivalents and restricted cash	(17,882)	(85,531)
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	$ 26,522	$ 61,115