Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net loss	$ (215,974)	$ (546,803)
Loss from discontinued operations, net of tax	(294,138)	(593,404)
Income from continuing operations	78,164	46,601
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	109,132	102,922
Deferred income taxes	3,608	11,119
Changes in current assets and liabilities, net of acquisitions:
Receivables	(44,909)	(10,712)
Inventories	(23,189)	(47,559)
Other current assets	(20,555)	24,192
Accounts payable	7,339	14,447
Other current liabilities	33,214	(4,335)
Other noncurrent changes	(14,626)	(16,479)
Net cash provided by continuing operations	128,178	120,196
Net cash provided by (used in) discontinued operations	(25,529)	74,068
Net cash provided by operating activities	102,649	194,264
Investing activities:
Capital expenditures	(220,098)	(272,514)
Net proceeds from sale or disposition of property and other	14,778	29,550
Investments	(262)	1,208
Net cash used in continuing operations	(205,582)	(241,756)
Net cash provided by (used in) discontinued operations	28,040	(160,622)
Net cash used in investing activities	(177,542)	(402,378)
Financing activities:
Issuance of long-term debt	387,625	320,988
Repayment of long-term debt	(196,771)	(35,137)
Proceeds from issuance of common stock	0	14,499
Dividends paid	(73,575)	(71,294)
Tax withholding on stock-based compensation	(323)	0
Net cash provided by continuing operations	116,956	229,056
Net cash provided by (used in) discontinued operations	(40,852)	62,229
Net cash provided by financing activities	76,104	291,285
Effect of exchange rate changes on cash and cash equivalents	3	(123)
Increase in cash and cash equivalents	1,214	83,048
Cash and cash equivalents - beginning of year	83,903	60,479
Cash and cash equivalents - end of period	$ 85,117	$ 143,527