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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (33,502) $ (96,458)
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 0 53,167
Depreciation, Depletion and Amortization 148,753 154,988
Impairment of Oil and Gas Properties 137,865 0
Stock-Based Compensation 6,702 5,624
(Gain) Loss on Sale of Assets (11,951) 7,276
Gains (Losses) on Extinguishment of Debt (822) 0
Gain (Loss) on Hedging Activity 22,463 (55,060)
Increase (Decrease) Cash Collateral from Counterparties (47,103) 84,331
Deferred Income Taxes (41,936) (23,582)
Equity in Earnings of Affiliates (12,330) (16,665)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital 0 4,512
Changes in Operating Assets:    
Accounts and Notes Receivable (27,908) (14,833)
Inventories (4,315) (18,458)
Prepaid Expenses 870 18,980
Changes in Other Assets 936 (9,864)
Changes in Operating Liabilities:    
Accounts Payable 4,016 (8,316)
Increase (Decrease) in Interest Payable, Net 34,411 35,867
Other Operating Liabilities 28,151 1,379
Changes in Other Liabilities (10,036) (3,313)
Other 10,930 4,087
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 205,194 123,662
Cash Provided by (Used in) Operating Activities, Discontinued Operations (75) 6,290
Net Cash Provided by Operating Activities 205,119 129,952
Investing Activities:    
Capital Expenditures (112,978) (77,656)
Proceeds from Sale of Productive Assets 19,427 8,453
Net Investment in Equity Affiliates 5,909 (5,578)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (87,642) (74,781)
Cash Provided by (Used in) Investing Activities, Discontinued Operations 0 395,757
Net Cash Used in Investing Activities (87,642) 320,976
Financing Activities:    
(Payments on) Proceeds from Short-Term Borrowings 0 (100,500)
Payments on Miscellaneous Borrowings (2,942) (2,095)
Payments On Long Term Notes Including Redemption Premium (98,243) 0
Net Proceeds from Revolver - MLP (4,000) 15,000
Noncontrolling Interest, Period Increase (Decrease) (5,467) (5,413)
Dividends Paid 0 (2,294)
Proceeds from Issuance of Common Stock 494 3
Treasury Stock Activity (6,278) (1,510)
Debt Issuance and Financing Fees (250) 0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations (116,686) (96,809)
Cash Provided by (Used in) Financing Activities, Discontinued Operations 0 (47)
Net Cash (Used in) Provided by Financing Activities (116,686) (96,856)
Net Increase in Cash and Cash Equivalents 791 354,072
Cash and Cash Equivalents, at Carrying Value 60,475 72,574
Cash and Cash Equivalents at End of Period $ 61,266 $ 426,646