CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net earnings	$ 63,299	$ 52,979
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	89,181	81,439
Net gain on sale of property, plant & equipment and businesses	(7,297)	(4,164)
Contributions to pension plans	(2,320)	(102,443)
Share-based compensation expense	5,724	6,794
Deferred tax expense (benefit)	774	7,968
Cost of debt purchase	0	6,922
Changes in assets and liabilities before initial effects of business acquisitions and dispositions	(45,765)	39,832
Other, net	12,568	3,641
Net cash provided by operating activities	116,164	92,968
Investing Activities
Purchases of property, plant & equipment	(122,019)	(128,688)
Proceeds from sale of property, plant & equipment	6,512	1,701
Proceeds from sale of businesses	1,744	11,256
Payment for businesses acquired, net of acquired cash	1,122	(76,259)
Other, net	(7,237)	(34)
Net cash used for investing activities	(119,878)	(192,024)
Financing Activities
Proceeds from short-term debt	196,200	252,000
Payment of short-term debt	(150,700)	(52,000)
Payment of current maturities and long-term debt	(6)	(892,038)
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	(55,568)
Dividends paid	(40,939)	(37,176)
Share-based compensation, shares withheld for taxes	(14,137)	(24,159)
Net cash used for financing activities	(9,582)	(1,076)
Net decrease in cash and cash equivalents and restricted cash	(13,296)	(100,132)
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	$ 31,108	$ 46,514