Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net income	$ 42,437	$ 37,325
Income from discontinued operations, net of tax	477	1,687	[1]
Income from continuing operations	41,960	35,638
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	52,729	51,325
Deferred income taxes	(2,068)	(332)
Changes in current assets and liabilities, net of acquisitions:
Receivables	62,711	63,684
Inventories	(29,997)	(13,676)
Other current assets	22,506	(31,006)
Accounts payable	(31,864)	(23,380)
Other current liabilities	(5,115)	(1,179)
Other noncurrent changes	(5,302)	2,161
Net cash provided by continuing operations	105,560	83,235
Net cash provided by discontinued operations	231	3,304
Net cash provided by operating activities	105,791	86,539
Investing activities:
Capital expenditures	(105,136)	(72,316)
Net proceeds from sale or disposition of property and other	5,966	117,967
Investments	(1,074)	(116)
Net cash provided by (used in) continuing operations	(100,244)	45,535
Net cash provided by discontinued operations	0	54
Net cash provided by (used in) investing activities	(100,244)	45,589
Financing activities:
Issuance of long-term debt	101,588	59,985
Repayment of long-term debt	(37,047)	(147,277)
Dividends paid	(38,573)	(37,767)
Repurchase of common stock	(5,020)	(1,684)
Tax withholding on stock-based compensation	(2,330)	(757)
Net cash provided by (used in) continuing operations	18,618	(127,500)
Net cash provided by discontinued operations	0	0
Net cash provided by (used in) financing activities	18,618	(127,500)
Increase in cash and cash equivalents	24,165	4,628
Cash and cash equivalents -- beginning of year	34,599	46,107
Cash and cash equivalents -- end of period	$ 58,764	$ 50,735

[1] Includes an elimination for the presentation of income tax adjustments between continuing and discontinued operations.