Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 25,130	$ 40,926
Loss from discontinued operations, net of tax	(409)	(163)
Income from continuing operations	25,539	41,089
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	69,239	59,897
Deferred income taxes	1,813	12,658
Changes in current assets and liabilities, net of acquisitions:
Receivables	44,549	(2,641)
Inventories	(29,337)	(21,407)
Other current assets	14,959	(31,586)
Accounts payable	(24,105)	356
Other current liabilities	(23,259)	(6,310)
Other noncurrent changes	326	(49,965)
Net cash provided by continuing operations	79,724	2,091
Net cash used in discontinued operations	(434)	(507)
Net cash provided by operating activities	79,290	1,584
Investing activities:
Capital expenditures	(139,485)	(133,839)
Acquisitions, net of cash acquired	(67,593)	(30,868)
Net proceeds from sale or disposition of property and other	4,540	4,938
Investments	68	(340)
Net cash used in investing activities	(202,470)	(160,109)
Financing activities:
Issuance of short-term borrowings	0	70,000
Issuance of long-term debt	248,021	141,338
Repayment of long-term debt	(36,242)	(52,964)
Proceeds from issuance of common stock	3,410	38,634
Dividends paid	(41,580)	(39,695)
Tax withholding on stock-based compensation	(362)	(3,015)
Net cash provided by financing activities	173,247	154,298
Increase (decrease) in cash and cash equivalents	50,067	(4,227)
Cash and cash equivalents -- beginning of year	66,459	53,948
Cash and cash equivalents -- end of period	$ 116,526	$ 49,721