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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities:      
Net income (loss) $ (67,258) $ (657,691) $ 294,338
Income (loss) from discontinued operations, net of tax [1] (300,354) (834,080) 109,311
Income from continuing operations 233,096 176,389 185,027
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 216,318 211,747 203,084
Deferred income taxes (2,049) (25,356) 54,963
Excess tax benefit on stock-based compensation 0 0 (4,729)
Changes in current assets and liabilities, net of acquisitions:      
Receivables (25,641) 4,704 6,652
Inventories 2,433 2,265 (17,484)
Other current assets (17,925) 60,182 (45,830)
Accounts payable 7,039 37,224 (47,092)
Other current liabilities 36,146 6,864 (17,252)
Other noncurrent changes (26,459) (10,240) (18,144)
Net cash provided by continuing operations 422,958 463,779 299,195
Net cash provided by discontinued operations 39,251 198,053 287,867
Net cash provided by operating activities 462,209 661,832 587,062
Investing activities:      
Capital expenditures (388,183) (536,832) (429,336)
Net proceeds from sale or disposition of property and other 44,826 54,569 28,899
Investments (1,396) 1,515 (1,041)
Net cash used in continuing operations (344,753) (480,748) (401,478)
Net cash provided by (used in) discontinued operations 39,658 98,295 (502,712)
Net cash used in investing activities (305,095) (382,453) (904,190)
Financing activities:      
Repayment of short-term borrowings 0 0 (11,500)
Issuance of long-term debt 309,064 345,920 606,168
Repayment of long-term debt (315,647) (566,498) (365,247)
Proceeds from issuance of common stock 0 21,898 150,060
Dividends paid (147,156) (142,835) (136,712)
Excess tax benefit on stock-based compensation 0 0 4,729
Tax withholding on stock-based compensation (323) 0 (5,564)
Net cash provided by (used in) continuing operations (154,062) (341,515) 241,934
Net cash provided by (used in) discontinued operations (40,852) 85,785 83,262
Net cash provided by (used in) financing activities (194,914) (255,730) 325,196
Effect of exchange rate changes on cash and cash equivalents 4 (225) (155)
Increase (decrease) in cash and cash equivalents (37,796) 23,424 7,913
Cash and cash equivalents - beginning of year 83,903 60,479 52,566
Cash and cash equivalents - end of year $ 46,107 $ 83,903 $ 60,479
[1] Includes eliminations for the presentation of income tax adjustments between continuing and discontinued operations.