Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income	$ 37,325	$ 13,829
Income (loss) from discontinued operations, net of tax	1,687	(18,036)
Income from continuing operations	35,638	31,865
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	51,325	54,884
Deferred income taxes	(332)	7,926
Changes in current assets and liabilities, net of acquisitions:
Receivables	63,684	61,931
Inventories	(13,676)	(18,828)
Other current assets	(31,006)	(22,909)
Accounts payable	(23,380)	(40,584)
Other current liabilities	(1,179)	18,690
Other noncurrent changes	2,161	(7,711)
Net cash provided by continuing operations	83,235	85,264
Net cash provided by (used in) discontinued operations	3,304	(39,715)
Net cash provided by operating activities	86,539	45,549
Investing activities:
Capital expenditures	(72,316)	(114,706)
Net proceeds from sale or disposition of property and other	117,967	10,411
Investments	(116)	(503)
Net cash provided by (used in) continuing operations	45,535	(104,798)
Net cash provided by discontinued operations	54	25,263
Net cash provided by (used in) investing activities	45,589	(79,535)
Financing activities:
Issuance of long-term debt	59,985	226,585
Repayment of long-term debt	(147,277)	(164,855)
Dividends paid	(37,767)	(36,784)
Repurchase of common stock	(1,684)	0
Tax withholding on stock-based compensation	(757)	(316)
Net cash provided by (used in) continuing operations	(127,500)	24,630
Net cash provided by discontinued operations	0	16,025
Net cash provided by (used in) financing activities	(127,500)	40,655
Effect of exchange rate changes on cash and cash equivalents	0	1
Increase in cash and cash equivalents	4,628	6,670
Cash and cash equivalents -- beginning of year	46,107	83,903
Cash and cash equivalents -- end of period	$ 50,735	$ 90,573