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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities:      
Net income (loss) $ (657,691) $ 294,338 $ 278,570
Income (loss) from discontinued operations, net of tax (772,385) 115,175 109,879
Income from continuing operations 114,694 179,163 168,691
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 227,730 203,980 200,398
Deferred income taxes 301 58,990 28,551
Excess tax benefit on stock-based compensation 0 (4,729) 0
Changes in current assets and liabilities, net of acquisitions:      
Receivables (313) 4,010 (25,635)
Inventories (17,100) (22,795) 28,292
Other current assets 50,097 (40,617) (13,569)
Accounts payable 49,117 (42,138) 26,285
Other current liabilities 6,325 (15,988) (26,360)
Other noncurrent changes 10,256 (21,450) (30,786)
Net cash provided by continuing operations 441,107 298,426 355,867
Net cash provided by discontinued operations 200,037 305,241 398,441
Net cash provided by operating activities 641,144 603,667 754,308
Investing activities:      
Capital expenditures (625,375) (608,028) (531,332)
Acquisitions, net of cash acquired 0 (269) 0
Net proceeds from sale or disposition of property and other 54,569 29,598 40,802
Investments 1,515 (1,041) 302
Proceeds from sale of equity method investments 0 0 1,896
Net cash used in continuing operations (569,291) (579,740) (488,332)
Net cash provided by (used in) discontinued operations 186,838 (324,451) (294,329)
Net cash used in investing activities (382,453) (904,191) (782,661)
Financing activities:      
Issuance of short-term borrowings 45,500 0 9,500
Repayment of short-term borrowings 0 (11,500) 0
Issuance of long-term debt 345,920 606,084 507,924
Repayment of long-term debt (569,498) (368,249) (423,707)
Proceeds from issuance of common stock 21,898 150,060 14,554
Dividends paid (142,835) (136,712) (98,405)
Excess tax benefit on stock-based compensation 0 4,729 0
Tax withholding on stock-based compensation 0 (5,564) 0
Contribution from noncontrolling interest 52,000 86,900 27,000
Distribution to noncontrolling interest (8,444) 0 0
Net cash provided by (used in) continuing operations (255,459) 325,748 36,866
Net cash used in discontinued operations (271) (554) 0
Net cash provided by financing activities (255,730) 325,194 36,866
Effect of exchange rate changes on cash and cash equivalents (225) (155) (215)
Increase (decrease) in cash and cash equivalents 2,736 24,515 8,298
Cash and cash equivalents - beginning of year 81,855 57,340 49,042
Cash and cash equivalents - end of year $ 84,591 $ 81,855 $ 57,340