2113100 - Disclosure - Acquisitions and Dispositions link:presentationLink link:calculationLink link:definitionLink 2413401 - Disclosure - Acquisitions and Dispositions (Details) link:presentationLink link:calculationLink link:definitionLink 2415403 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Notes) link:presentationLink link:calculationLink link:definitionLink 2215201 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Policies) link:presentationLink link:calculationLink link:definitionLink 2315302 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Tables) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 2209201 - Disclosure - Commitments and Contingencies Commitments and Contingencies (Policies) link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Commitments and Contingencies (Details Textual) link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 2405403 - Disclosure - Consolidated income tax provision (benefit) (Details) link:presentationLink link:calculationLink link:definitionLink 1005000 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 1004501 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2104100 - Disclosure - Earnings Per Share link:presentationLink link:calculationLink link:definitionLink 2404403 - Disclosure - Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2204201 - Disclosure - Earnings Per Share Earning Per Share (Policies) link:presentationLink link:calculationLink link:definitionLink 2304302 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 2414403 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 2214201 - Disclosure - Fair Value Measurements Fair Value Measurements (Policies) link:presentationLink link:calculationLink link:definitionLink 2314302 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Long-Term Debt link:presentationLink link:calculationLink link:definitionLink 2406403 - Disclosure - Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2206201 - Disclosure - Long-Term Debt Long-Term Debt (Policies) link:presentationLink link:calculationLink link:definitionLink 2306302 - Disclosure - Long-Term Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Price-Risk Management Price-Risk Management (Details) link:presentationLink link:calculationLink link:definitionLink 2107100 - Disclosure - Price-Risk Management Price-Risk Management (Notes) link:presentationLink link:calculationLink link:definitionLink 2207201 - Disclosure - Price-Risk Management Price-Risk Management (Policies) link:presentationLink link:calculationLink link:definitionLink 2307302 - Disclosure - Price-Risk Management Price-Risk Management (Tables) link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Provision (Benefit) for Income Taxes link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Provision (Benefit) for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2405406 - Disclosure - Provision (Benefit) for Income Taxes (Details Textual) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Provision (Benefit) for Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2405404 - Disclosure - Reconciliation of income taxes using federal statutory rate to effective income tax rate (Details) link:presentationLink link:calculationLink link:definitionLink 2412403 - Disclosure - Revenue Recognition Revenue Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 2212201 - Disclosure - Revenue Recognition Revenue Recognition (Policies) link:presentationLink link:calculationLink link:definitionLink 2312302 - Disclosure - Revenue Recognition Revenue Recognition (Tables) link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Revenue Recognition Revenue Recognition(Notes) link:presentationLink link:calculationLink link:definitionLink 2410403 - Disclosure - Share-Based Compensation (Details 1) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - Share-Based Compensation (Details Textual) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Share-Based Compensation Share-Based Compensation (Notes) link:presentationLink link:calculationLink link:definitionLink 2210201 - Disclosure - Share-Based Compensation Share-Based Compensation (Policies) link:presentationLink link:calculationLink link:definitionLink 2310302 - Disclosure - Share-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 2103100 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 2403403 - Disclosure - Summary of Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 2403404 - Disclosure - Summary of Significant Accounting Policies (Details Textual) link:presentationLink link:calculationLink link:definitionLink 2203201 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 2303302 - Disclosure - Summary of Signigicant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 2405405 - Disclosure - Tax effects of temporary differences representing the net DTA (DTL) (Details) link:presentationLink link:calculationLink link:definitionLink