Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income (loss)	$ (546,803)	$ 109,466
Income (loss) from discontinued operations, net of tax	(576,020)	48,993
Income from continuing operations	29,217	60,473
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	107,151	100,645
Deferred income taxes	24,874	30,516
Excess tax benefit on stock-based compensation	0	(4,729)
Changes in current assets and liabilities:
Receivables	(37,661)	18,518
Inventories	(67,604)	(51,467)
Other current assets	4,545	(46,003)
Accounts payable	44,927	(30,741)
Other current liabilities	(3,426)	(39,300)
Other noncurrent changes	(15,602)	(6,379)
Net cash provided by continuing operations	86,421	31,533
Net cash provided by discontinued operations	87,312	192,953
Net cash provided by operating activities	173,733	224,486
Investing activities:
Capital expenditures	(355,898)	(215,970)
Net proceeds from sale or disposition of property and other	29,550	11,222
Investments	1,208	(1,208)
Net cash used in continuing operations	(325,140)	(205,956)
Net cash used in discontinued operations	(77,238)	(379,764)
Net cash used in investing activities	(402,378)	(585,720)
Financing activities:
Issuance of short-term borrowings	26,000	0
Repayment of short-term borrowings	0	(11,500)
Issuance of long-term debt	320,988	441,451
Repayment of long-term debt	(38,137)	(111,268)
Proceeds from issuance of common stock	14,499	132,268
Dividends paid	(71,294)	(67,717)
Excess tax benefit on stock-based compensation	0	4,729
Tax withholding on stock-based compensation	0	(5,564)
Contribution from noncontrolling interest	39,500	32,500
Net cash provided by continuing operations	291,556	414,899
Net cash used in discontinued operations	(271)	(273)
Net cash provided by financing activities	291,285	414,626
Effect of exchange rate changes on cash and cash equivalents	(123)	85
Increase in cash and cash equivalents	62,517	53,477
Cash and cash equivalents - beginning of year	81,855	57,340
Cash and cash equivalents - end of period	$ 144,372	$ 110,817