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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) $ (839,148) $ (364,475) $ 163,090
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:      
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax 303,183 14,209 1,857
Depreciation, Depletion and Amortization 598,503 567,120 532,643
Gain (Loss) on Hedging Activity 141,021 (392,942) (23,193)
Derivative, Cash Received on Hedge 245,212 196,348 19,025
Impairment of Long-Lived Assets to be Disposed of 0 828,905 0
Non-Cash Other Post-Employment Benefits 0 (261,750) (45,749)
Share-based Compensation 31,483 24,513 41,877
(Gain) Loss on Sale of Assets (19,498) (74,173) (43,198)
Gains (Losses) on Extinguishment of Debt 0 67,751 95,267
Deferred Income Tax Expense (Benefit) 120,305 (140,472) (7,319)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital 22,268 35,466 102,174
Equity in Earnings of Affiliates (53,078) (54,897) (49,791)
Changes in Operating Assets:      
Accounts and Notes Receivable (48,014) 160,370 (89,928)
Inventories 1,330 5,573 49,443
Prepaid Expenses 84,026 128,405 4,788
Changes in Other Assets (98,572) 3,311 (16,242)
Changes in Operating Liabilities:      
Accounts Payable (27,371) (145,875) 3,974
Increase (Decrease) in Interest Payable, Net (1,040) 26,649 (9,868)
Other Operating Liabilities (20,356) (147,110) 227,467
Changes in Other Liabilities (9,724) (9,916) (161,024)
Other 28,820 32,667 45,093
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 459,350 499,677 840,386
Cash Provided by (Used in) Operating Activities, Discontinued Operations 9,935 6,172 96,390
Net Cash Provided by Operating Activities 469,285 505,849 936,776
Investing Activities:      
Capital Expenditures (226,820) (982,934) (1,459,452)
Proceeds from Divestiture of Interest in Joint Venture 213,295 0 0
Proceeds from Sales of Assets 59,902 110,571 356,836
Net Investment in Equity Affiliates 73,743 (84,221) 95,207
Cash Provided by (Used in) Investing Activities, Discontinued Operations 367,251 (39,633) (33,973)
Net Cash Used in Investing Activities 487,371 (996,217) (1,041,382)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations 120,120 (956,584) (1,007,409)
Financing Activities:      
(Payments on) Proceeds from Short-Term Borrowings (952,000) 952,000 (11,736)
Payments on Miscellaneous Borrowings (8,312) (4,282) (10,286)
Payments On Long Term Notes Including Redemption Premium 0 (1,263,719) (1,819,005)
Net Proceeds from Revolver - MLP 16,000 185,000 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (21,657) (5,060) 0
Proceeds from Noncontrolling Interests 0 148,359 0
Proceeds from Issuance of Long-Term Notes 0 492,760 1,859,920
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities 0 208 2,629
Dividends Paid (2,294) (33,281) (57,506)
Proceeds from Issuance of Common Stock 4 8,288 15,016
Treasury Stock, Value, Acquired, Cost Method 0 (71,674) 0
Payments of Debt Issuance Costs (482) (22,586) (24,861)
Cash Provided by (Used in) Financing Activities, Discontinued Operations (14) (56) 0
Net Cash (Used in) Provided by Financing Activities (968,755) 385,957 (45,829)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (968,741) 386,013 (45,829)
Net Increase in Cash and Cash Equivalents (12,099) (104,411) (150,435)
Cash and Cash Equivalents at Beginning of Period 72,574 176,985 327,420
Cash and Cash Equivalents at End of Period $ 60,475 $ 72,574 $ 176,985