2105100 - Disclosure - Acquisitions and Divestitures
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2405404 - Disclosure - Acquisitions and Divestitures Acquisitions (Revenue and Income of Acquiree Since Acquisition Date) (Details)
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2405402 - Disclosure - Acquisitions and Divestitures (Narrative) (Details)
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2305301 - Disclosure - Acquisitions and Divestitures (Tables)
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2405405 - Disclosure - Acquisitions (Pro Forma Information) (Details)
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2405403 - Disclosure - Acquisitions (Schedule of Consideration Paid for Assets Acquired and Liabilities Assumed) (Table) (Details)
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2114100 - Disclosure - Commitments And Contingencies
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1001000 - Statement - Consolidated Balance Sheets
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1001501 - Statement - Consolidated Balance Sheets (Parenthetical)
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1004000 - Statement - Consolidated Statements Of Cash Flows
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1002000 - Statement - Consolidated Statements Of Operations
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1002501 - Statement - Consolidated Statements Of Operations (Unaudited) (Parenthetical)
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1003000 - Statement - Consolidated Statements Of Shareholders' Equity
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2119100 - Disclosure - Derivative Instruments
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2419402 - Disclosure - Derivative Instruments (Narrative) (Details)
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2419410 - Disclosure - Derivative Instruments (Schedule of Cash Received for Derivative Settlements) (Details)
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2419407 - Disclosure - Derivative Instruments (Schedule of Contingent Consideration) (Details)
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2419404 - Disclosure - Derivative Instruments (Schedule of Crude Oil Derivative Positions) (Details)
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2419408 - Disclosure - Derivative Instruments (Schedule of Derivative Instruments in Statement of Financial Position) (Details)
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2419409 - Disclosure - Derivative Instruments (Schedule of (Gain) Loss on Derivative Instruments) (Details)
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2419406 - Disclosure - Derivative Instruments (Schedule of Natural Gas Derivative Positions) (Details)
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2419405 - Disclosure - Derivative Instruments (Schedule of NGL Derivative Positions) (Details)
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2319301 - Disclosure - Derivative Instruments (Tables)
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2103100 - Disclosure - Discontinued Operations
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2403402 - Disclosure - Discontinued Operations (Narrative) (Details)
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2403403 - Disclosure - Discontinued Operations (Statements of Operations) (Details)
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2303301 - Disclosure - Discontinued Operations (Tables)
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0001000 - Document - Document And Entity Information
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2118100 - Disclosure - Earnings per Share
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2418402 - Disclosure - Earnings per Share (Details)
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2418404 - Disclosure - Earnings per Share (Schedule of Anti-dilutive Shares) (Details)
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2418403 - Disclosure - Earnings per Share (Schedule of Earnings per Share) (Details)
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2318301 - Disclosure - Earnings per Share (Tables)
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2120100 - Disclosure - Fair Value Measurements
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2420402 - Disclosure - Fair Value Measurements (Narrative) (Details)
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2420404 - Disclosure - Fair Value Measurements (Schedule of Assets and Liabilities, Level 3 Reconciliation) (Details)
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2420403 - Disclosure - Fair Value Measurements (Schedule of Assets and Liabilities Measured on Recurring Basis) (Details)
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2420405 - Disclosure - Fair Value Measurements (Schedule of Carrying Value and Fair Value of Debt Instruments) (Details)
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2320301 - Disclosure - Fair Value Measurements (Tables)
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2109100 - Disclosure - Income Taxes
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2409402 - Disclosure - Income Taxes (Narrative) (Details)
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2409403 - Disclosure - Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
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2309301 - Disclosure - Income Taxes (Tables)
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2107100 - Disclosure - Leases
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2407402 - Disclosure - Leases (Details)
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2407404 - Disclosure - Leases (Operating and Financial Leases Financial Statement Location) (Details)
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2407403 - Disclosure - Leases (Schedule of Lease Cost) (Details)
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2407407 - Disclosure - Leases (Schedule of Lease Liabilities) (Details)
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2407406 - Disclosure - Leases (Schedule of Lease Terms and Discount Rates) (Details)
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2407405 - Disclosure - Leases (Supplemental Cash Flow Information Leases) (Details)
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2307301 - Disclosure - Leases (Tables)
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2113100 - Disclosure - Long-Term Debt
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2413404 - Disclosure - Long-Term Debt (Interest and Commitment Fee Rates) (Details)
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2413402 - Disclosure - Long-Term Debt (Narrative) (Details)
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2413403 - Disclosure - Long-Term Debt (Schedule of Long-Term Debt) (Details)
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2313301 - Disclosure - Long-Term Debt (Tables)
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2101100 - Disclosure - Nature Of Operations
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2116100 - Disclosure - Preferred Stock
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2416402 - Disclosure - Preferred Stock (Narrative) (Details)
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2416403 - Disclosure - Preferred Stock (Schedule of Dividends Paid in Common Stock) (Details)
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2416404 - Disclosure - Preferred Stock (Schedule of Preferred Stock Activity) (Details)
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2416405 - Disclosure - Preferred Stock (Schedule of Preferred Stock Redemption Premiums) (Details)
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2316301 - Disclosure - Preferred Stock (Tables)
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2106100 - Disclosure - Property And Equipment, Net
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2406402 - Disclosure - Property and Equipment, Net (Narrative) (Details)
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2406404 - Disclosure - Property and Equipment, Net (Schedule of Impairment of Oil and Gas Properties) (Details)
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2406403 - Disclosure - Property And Equipment, Net (Schedule Of Property And Equipment) (Details)
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2306301 - Disclosure - Property And Equipment, Net (Tables)
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2117100 - Disclosure - Shareholders' Equity and Stock Incentive Plans
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2417402 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Narrative) (Details)
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2417407 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Schedule of Results of Total Shareholder Return Ranking) (Details)
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2417409 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Schedule of Share-Based Compensation Expense) (Details)
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2417406 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Summary of Performance Share Award Activity) (Details)
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2417408 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Summary of Performance Share Awards Fair Value Assumptions) (Details)
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2417403 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Summary of Restricted Stock Award and Unit Activity) (Details)
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2417404 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Summary of SARs Activity) (Details)
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2417405 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Summary of SARs Fair Value Assumptions) (Details)
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2317301 - Disclosure - Shareholders' Equity and Stock Incentive Plans (Tables)
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2123100 - Disclosure - Subsequent Events
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2423403 - Disclosure - Subsequent Events, Derivative Instruments (Schedule of Crude Oil Derivative Positions) (Details)
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2423404 - Disclosure - Subsequent Events, Derivative Instruments (Schedule of Natural Gas Derivative Positions) (Details)
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2423405 - Disclosure - Subsequent Events (Interest and Commitment Fee Rates) (Details)
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2423402 - Disclosure - Subsequent Events (Narrative) (Details)
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2323301 - Disclosure - Subsequent Events (Tables)
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2102100 - Disclosure - Summary of Significant Accounting Policies
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2402403 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details)
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2202201 - Disclosure - Summary of Significant Accounting Policies (Policy)
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2302302 - Disclosure - Summary of Significant Accounting Policies (Tables)
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2122100 - Disclosure - Supplemental Cash Flow Information
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2422402 - Disclosure - Supplemental Cash Flow Information (Details)
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2422403 - Disclosure - Supplemental Cash Flow Information (Supplemental Cash Flow Disclosures) (Details)
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2322301 - Disclosure - Supplemental Cash Flow Information (Tables)
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