2.3.0.11 Html 45 151 1 false 7 0 false 3 true false R1.htm 0010 - Statement - Consolidated Balance Sheets Sheet http://www.cng.com/role/BalanceSheetYearEnd Consolidated Balance Sheets false false R2.htm 0015 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.cng.com/role/BalanceSheetYearEndParenthetical Consolidated Balance Sheets (Parenthetical) false false R3.htm 0020 - Statement - Consolidated Statements of Operations Sheet http://www.cng.com/role/StatementOfIncomeYearEnd Consolidated Statements of Operations false false R4.htm 0030 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://www.cng.com/role/StatementOfStockholdersEquityYearEnd Consolidated Statements of Stockholders' Equity false false R5.htm 0040 - Statement - Consolidated Statements of Cash Flows Sheet http://www.cng.com/role/CashFlowsYearEnd Consolidated Statements of Cash Flows false false R6.htm 1010 - Disclosure - Nature of Operations and Significant Accounting Policies Sheet http://www.cng.com/role/DisclosureNatureOfOperationsAndSignificantAccountingPoliciesYearEnd Nature of Operations and Significant Accounting Policies false false R7.htm 1020 - Disclosure - Change in Method of Determining Oil and Gas Reserves Sheet http://www.cng.com/role/DisclosureChangeInMethodOfDeterminingOilAndGasReservesYearEnd Change in Method of Determining Oil and Gas Reserves false false R8.htm 1030 - Disclosure - Fair Value Measurements Sheet http://www.cng.com/role/DisclosureFairValueMeasurementsYearEnd Fair Value Measurements false false R9.htm 1040 - Disclosure - Dispositions and Acquisitions Sheet http://www.cng.com/role/DisclosureDispositionsAndAcquisitionsYearEnd Dispositions and Acquisitions false false R10.htm 1050 - Disclosure - Property and Equipment Sheet http://www.cng.com/role/DisclosurePropertyAndEquipmentYearEnd Property and Equipment false false R11.htm 1060 - Disclosure - Equity Method Investment Sheet http://www.cng.com/role/DisclosureEquityMethodInvestmentYearEnd Equity Method Investment false false R12.htm 1070 - Disclosure - Bank Credit Facility Sheet http://www.cng.com/role/DisclosureBankCreditFacilityYearEnd Bank Credit Facility false false R13.htm 1080 - Disclosure - Income Taxes Sheet http://www.cng.com/role/DisclosureIncomeTaxesYearEnd Income Taxes false false R14.htm 1090 - Disclosure - Stockholders' Equity Sheet http://www.cng.com/role/DisclosureStockholdersEquityYearEnd Stockholders' Equity false false R15.htm 1100 - Disclosure - Accounts Payable and Accrued Liabilities Sheet http://www.cng.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesYearEnd Accounts Payable and Accrued Liabilities false false R16.htm 1110 - Disclosure - Physical Delivery Contracts and Gas Derivatives Sheet http://www.cng.com/role/DisclosurePhysicalDeliveryContractsAndGasDerivativesYearEnd Physical Delivery Contracts and Gas Derivatives false false R17.htm 1120 - Disclosure - Commitments Sheet http://www.cng.com/role/DisclosureCommitmentsYearEnd Commitments false false R18.htm 1130 - Disclosure - Retirement Savings Plan Sheet http://www.cng.com/role/DisclosureRetirementSavingsPlanYearEnd Retirement Savings Plan false false R19.htm 1140 - Disclosure - Related Party Transactions Sheet http://www.cng.com/role/DisclosureRelatedPartyTransactionsYearEnd Related Party Transactions false false R20.htm 1150 - Disclosure - Supplemental Cash Flow Disclosure Sheet http://www.cng.com/role/DisclosureSupplementalCashFlowDisclosureYearEnd Supplemental Cash Flow Disclosure false false R21.htm 1160 - Disclosure - Subsequent Events Sheet http://www.cng.com/role/DisclosureSubsequentEventsYearEnd Subsequent Events false false R22.htm 1170 - Disclosure - Supplemental Financial Data - Oil and Gas Producing Activities (unaudited) Sheet http://www.cng.com/role/DisclosureSupplementalFinancialDataOilAndGasProducingActivitiesYearEnd Supplemental Financial Data - Oil and Gas Producing Activities (unaudited) false false R23.htm 6010 - Statement - Consolidated Balance Sheets Sheet http://www.cng.com/role/BalanceSheetQuarterEnd Consolidated Balance Sheets false false R24.htm 6015 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.cng.com/role/BalanceSheetQuarterEndParenthetical Consolidated Balance Sheets (Parenthetical) false false R25.htm 6020 - Statement - Consolidated Statements of Operations Sheet http://www.cng.com/role/StatementOfIncomeQuarterEnd Consolidated Statements of Operations false false R26.htm 6030 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://www.cng.com/role/StatementOfStockholdersEquityQuarterEnd Consolidated Statements of Stockholders' Equity false false R27.htm 6040 - Statement - Consolidated Statements of Cash Flows Sheet http://www.cng.com/role/CashFlowsQuarterEnd Consolidated Statements of Cash Flows false false R28.htm 7010 - Disclosure - Organization Sheet http://www.cng.com/role/DisclosureOrganizationQuarterEnd Organization false false R29.htm 7020 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.cng.com/role/DisclosureSummaryOfSignificantAccountingPoliciesQuarterEnd Summary of Significant Accounting Policies false false R30.htm 7030 - Disclosure - Reverse Merger Sheet http://www.cng.com/role/DisclosureReverseMergerQuarterEnd Reverse Merger false false R31.htm 7040 - Disclosure - Acquisitions Sheet http://www.cng.com/role/DisclosureAcquisitionsQuarterEnd Acquisitions false false R32.htm 7050 - Disclosure - Fair Value Measurements Sheet http://www.cng.com/role/DisclosureFairValueMeasurementsQuarterEnd Fair Value Measurements false false R33.htm 7060 - Disclosure - Property and Equipment Sheet http://www.cng.com/role/DisclosurePropertyAndEquipmentQuarterEnd Property and Equipment false false R34.htm 7070 - Disclosure - Bank Credit Facility Sheet http://www.cng.com/role/DisclosureBankCreditFacilityQuarterEnd Bank Credit Facility false false R35.htm 7080 - Disclosure - Income Taxes Sheet http://www.cng.com/role/DisclosureIncomeTaxesQuarterEnd Income Taxes false false R36.htm 7090 - Disclosure - Stockholders' Equity Sheet http://www.cng.com/role/DisclosureStockholdersEquityQuarterEnd Stockholders' Equity false false R37.htm 7100 - Disclosure - Accounts Payable and Accrued Liabilities Sheet http://www.cng.com/role/DisclosureAccountsPayableAndAccruedLiabilitiesQuarterEnd Accounts Payable and Accrued Liabilities false false R38.htm 7110 - Disclosure - Physical Delivery Contracts and Gas Derivatives Sheet http://www.cng.com/role/DisclosurePhysicalDeliveryContractsAndGasDerivativesQuarterEnd Physical Delivery Contracts and Gas Derivatives false false R39.htm 7120 - Disclosure - Related Party Transactions Sheet http://www.cng.com/role/DisclosureRelatedPartyTransactionsQuarterEnd Related Party Transactions false false R40.htm 7130 - Disclosure - Supplemental Cash Flow Disclosure Sheet http://www.cng.com/role/DisclosureSupplementalCashFlowDisclosureQuarterEnd Supplemental Cash Flow Disclosure false false R41.htm 7140 - Disclosure - Commitments and Contingencies Sheet http://www.cng.com/role/DisclosureCommitmentsAndContingenciesQuarterEnd Commitments and Contingencies false false R42.htm 7150 - Disclosure - Subsequent Events Sheet http://www.cng.com/role/DisclosureSubsequentEventsQuarterEnd Subsequent Events false false R43.htm 9999 - Document - Document and Entity Information Sheet http://www.cng.com/role/DocumentAndEntityInformation Document and Entity Information false false All Reports Book All Reports Process Flow-Through: 0010 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Jun. 30, 2011' Process Flow-Through: Removing column 'Jun. 30, 2010' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 0015 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Jun. 30, 2011' Process Flow-Through: 0020 - Statement - Consolidated Statements of Operations Process Flow-Through: 0040 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: Removing column '6 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '6 Months Ended Jun. 30, 2010' Process Flow-Through: 6010 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Jun. 30, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 6015 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 6020 - Statement - Consolidated Statements of Operations Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2009' Process Flow-Through: 6040 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2009' crbo-20110630.xml crbo-20110630.xsd crbo-20110630_cal.xml crbo-20110630_def.xml crbo-20110630_lab.xml crbo-20110630_pre.xml true true