CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net earnings	$ 282,439	$ 132,289
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	213,362	204,770
Net gain on sale of property, plant & equipment and businesses	(2,934)	(7,423)
Contributions to pension plans	(7,126)	(11,337)
Share-based compensation expense	15,645	14,020
Excess tax benefits from share-based compensation	(26,747)	(16,950)
Deferred tax provision (benefit)	25,094	(7,640)
Cost of debt purchase	0	67,075
Changes in assets and liabilities before initial effects of business acquisitions and dispositions	(121,097)	(79,000)
Other, net	(33,188)	(14,467)
Net cash provided by operating activities	345,448	281,337
Investing Activities
Purchases of property, plant & equipment	(287,440)	(214,815)
Proceeds from sale of property, plant & equipment	5,865	4,464
Payment for businesses acquired, net of acquired cash	(1,611)	(20,801)
Decrease in restricted cash	1,150	0
Other, net	2,488	(301)
Net cash used for investing activities	(279,548)	(231,453)
Financing Activities
Proceeds from line of credit	3,000	291,000
Payments of line of credit	(3,000)	(206,000)
Payments of current maturities and long-term debt	(14)	(545,056)
Proceeds from issuance of long-term debt	0	400,000
Debt and line of credit issuance costs	0	(7,382)
Purchases of common stock	(161,463)	0
Dividends paid	(79,865)	(39,878)
Proceeds from exercise of stock options	0	67,888
Excess tax benefits from share-based compensation	26,747	16,950
Other, net	0	2
Net cash used for financing activities	(214,595)	(22,476)
Net increase (decrease) in cash and cash equivalents	(148,695)	27,408
Cash and cash equivalents at beginning of year	284,060	141,273
Cash and cash equivalents at end of period	$ 135,365	$ 168,681