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Advance to operators (Details) link:presentationLink link:calculationLink link:definitionLink 9954489 - Disclosure - Summary of significant accounting policies - Oil and natural gas properties (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - Summary of significant accounting policies - Derivative instruments- common stock warrants (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - Summary of significant accounting policies - Equity Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - Summary of significant accounting policies - Revenue recognition (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - Summary of significant accounting policies - Production and Ad Valorem taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Summary of significant accounting policies - Recently issued and applicable accounting pronouncements (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - Derivative financial instruments - Volume of derivative activities (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - Derivative financial instruments - Impact of commodity derivatives on earnings (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - Derivative financial instruments - Common stock warrants (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - Fair value measurements - Carrying amounts and fair values of financial instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - Fair value measurements - Fair values - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - Fair value measurements - 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Stock incentive plan - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954515 - Disclosure - Stock incentive plan - Summary of company's activity under the Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9954516 - Disclosure - Stock incentive plan - Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954517 - Disclosure - Stock incentive plan - Restricted Stock Awards and PSU (Details) link:presentationLink link:calculationLink link:definitionLink 9954518 - Disclosure - Stock incentive plan - Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954519 - Disclosure - Stock incentive plan - Assumptions to Estimate the Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9954520 - Disclosure - Stock incentive plan - Future Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954521 - 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