Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income (loss)	$ 13,829	$ (309,445)
Loss from discontinued operations, net of tax	(835)	(324,605)
Income from continuing operations	14,664	15,160
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	60,259	52,998
Deferred income taxes	6,902	16,301
Changes in current assets and liabilities, net of acquisitions:
Receivables	58,435	83,544
Inventories	(22,298)	(47,283)
Other current assets	(22,730)	4,021
Accounts payable	(37,205)	(34,696)
Other current liabilities	13,800	(10,839)
Other noncurrent changes	(4,047)	(5,043)
Net cash provided by continuing operations	67,780	74,163
Net cash provided by (used in) discontinued operations	(22,554)	24,697
Net cash provided by operating activities	45,226	98,860
Investing activities:
Capital expenditures	(115,194)	(135,295)
Net proceeds from sale or disposition of property and other	10,456	25,029
Investments	(503)	1,593
Net cash used in continuing operations	(105,241)	(108,673)
Net cash provided by (used in) discontinued operations	25,706	(51,540)
Net cash used in investing activities	(79,535)	(160,213)
Financing activities:
Issuance of short-term borrowings	16,025	16,100
Issuance of long-term debt	226,585	149,332
Repayment of long-term debt	(164,855)	(54,019)
Proceeds from issuance of common stock	0	9,864
Dividends paid	(36,784)	(35,607)
Tax withholding on stock-based compensation	(316)	0
Contribution from noncontrolling interest	0	20,500
Net cash provided by continuing operations	40,655	106,170
Net cash used in discontinued operations	0	(143)
Net cash provided by financing activities	40,655	106,027
Effect of exchange rate changes on cash and cash equivalents	1	(89)
Increase in cash and cash equivalents	6,347	44,585
Cash and cash equivalents - beginning of year	84,591	81,855
Cash and cash equivalents - end of period	$ 90,938	$ 126,440