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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities:    
Net income (loss) $ (132,988) $ (696,029)
Loss from discontinued operations, net of tax (299,538) (816,517)
Income from continuing operations 166,550 120,488
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and amortization 163,226 154,669
Deferred income taxes (1,346) (48)
Changes in current assets and liabilities, net of acquisitions:    
Receivables (75,308) (76,447)
Inventories (4,153) (3,660)
Other current assets (18,824) 34,493
Accounts payable 15,514 47,629
Other current liabilities 48,973 5,187
Other noncurrent changes (25,284) (4,478)
Net cash provided by continuing operations 269,348 277,833
Net cash provided by discontinued operations 7,127 125,738
Net cash provided by operating activities 276,475 403,571
Investing activities:    
Capital expenditures (303,873) (397,005)
Net proceeds from sale or disposition of property and other 17,583 37,679
Investments 56 1,309
Net cash used in continuing operations (286,234) (358,017)
Net cash provided by (used in) discontinued operations 31,918 (185,999)
Net cash used in investing activities (254,316) (544,016)
Financing activities:    
Issuance of long-term debt 341,777 327,475
Repayment of long-term debt (236,433) (143,333)
Proceeds from issuance of common stock 0 21,894
Dividends paid (110,366) (107,028)
Tax withholding on stock-based compensation (323) 0
Net cash provided by (used in) continuing operations (5,345) 99,008
Net cash provided by (used in) discontinued operations (40,852) 69,780
Net cash provided by (used in) financing activities (46,197) 168,788
Effect of exchange rate changes on cash and cash equivalents 3 (192)
Increase (decrease) in cash and cash equivalents (24,035) 28,151
Cash and cash equivalents - beginning of year 83,903 60,479
Cash and cash equivalents - end of period $ 59,868 $ 88,630