Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income	$ 86,239	$ 78,539
Income (loss) from discontinued operations, net of tax	203	(1,504)	[1]
Income from continuing operations	86,036	80,043
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	106,282	102,983
Deferred income taxes	4,186	(5,293)
Changes in current assets and liabilities, net of acquisitions:
Receivables	(13,853)	(43,478)
Inventories	(47,396)	(13,573)
Other current assets	29,072	(15,799)
Accounts payable	15,748	11,611
Other current liabilities	7,849	(6,387)
Other noncurrent changes	(11,566)	(4,460)
Net cash provided by continuing operations	176,358	105,647
Net cash provided by discontinued operations	224	33,846
Net cash provided by operating activities	176,582	139,493
Investing activities:
Capital expenditures	(210,612)	(143,764)
Acquisitions, net of cash acquired	(20,009)	0
Net proceeds from sale or disposition of property and other	9,286	119,361
Investments	(916)	(358)
Net cash used in continuing operations	(222,251)	(24,761)
Net cash provided by discontinued operations	0	2,234
Net cash used in investing activities	(222,251)	(22,527)
Financing activities:
Issuance of long-term debt	240,746	63,827
Repayment of long-term debt	(103,521)	(93,275)
Dividends paid	(77,145)	(75,535)
Redemption of preferred stock	0	15,600
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	52,730	(123,024)
Net cash provided by discontinued operations	0	0
Net cash provided by (used in) financing activities	52,730	(123,024)
Effect of exchange rate changes on cash and cash equivalents	(1)	(1)
Increase (decrease) in cash and cash equivalents	7,060	(6,059)
Cash and cash equivalents -- beginning of year	34,599	46,107
Cash and cash equivalents -- end of period	$ 41,659	$ 40,048

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