CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net earnings	$ 165,060	$ 164,866
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation, depletion, accretion and amortization	148,339	141,314
Net gain on sale of property, plant & equipment and businesses	(3,142)	(911)
Contributions to pension plans	(4,744)	(4,737)
Share-based compensation expense	13,671	10,832
Deferred tax expense (benefit)	2,901	2,592
Changes in assets and liabilities before initial effects of business acquisitions and dispositions	(170,701)	(157,216)
Other, net	3,838	(1,738)
Net cash provided by operating activities	155,222	155,002
Investing Activities
Purchases of property, plant & equipment	(291,034)	(199,764)
Proceeds from sale of property, plant & equipment	8,530	2,427
Payment for businesses acquired, net of acquired cash	(210,562)	(1,611)
Decrease in restricted cash	9,033	1,150
Other, net	405	1,862
Net cash used for investing activities	(483,628)	(195,936)
Financing Activities
Proceeds from line of credit	5,000	3,000
Payment of line of credit	(5,000)	(3,000)
Payment of current maturities and long-term debt	(235,007)	(9)
Proceeds from issuance of long-term debt	1,600,000	0
Debt discounts and issuance costs	(15,046)	0
Purchases of common stock	(60,303)	(69,156)
Dividends paid	(66,194)	(53,338)
Share-based compensation, shares withheld for taxes	(24,231)	(28,721)
Net cash provided by (used for) financing activities	1,199,219	(151,224)
Net increase (decrease) in cash and cash equivalents	870,813	(192,158)
Cash and cash equivalents at beginning of year	258,986	284,060
Cash and cash equivalents at end of period	$ 1,129,799	$ 91,902