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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":849000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06","frame":"CY2012Q4I"},{"end":"2013-12-31","val":904000,"accn":"0001047469-14-001905","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2013Q4I"},{"end":"2014-12-31","val":962000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2014Q4I"},{"end":"2015-12-31","val":478000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2015Q4I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue":{"label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10","description":"Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. 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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.","units":{"USD":[{"end":"2011-12-31","val":1349000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1415000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06","frame":"CY2012Q4I"}]}},"BankruptcyClaimsAmountOfClaimsFiled":{"label":"Bankruptcy Claims, Amount of Claims Filed","description":"Amount of bankruptcy claim filed with bankruptcy court.","units":{"USD":[{"start":"2016-07-01","end":"2016-09-30","val":1200000,"accn":"0001193125-17-115606","fy":2016,"fp":"Q3","form":"10-Q","filed":"2017-04-07","frame":"CY2016Q3"}]}},"BankruptcyClaimsAmountOfClaimsUnderReviewByManagement":{"label":"Bankruptcy Claims, Amount of Claims under Review by Management","description":"Amount of bankruptcy claim under review by management.","units":{"USD":[{"end":"2016-03-31","val":1500000,"accn":"0001193125-17-115548","fy":2016,"fp":"Q1","form":"10-Q","filed":"2017-04-07","frame":"CY2016Q1I"},{"end":"2016-06-30","val":1500000,"accn":"0001193125-17-115586","fy":2016,"fp":"Q2","form":"10-Q","filed":"2017-04-07","frame":"CY2016Q2I"},{"end":"2016-09-30","val":1500000,"accn":"0001193125-17-115606","fy":2016,"fp":"Q3","form":"10-Q","filed":"2017-04-07","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1500000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q4I"}]}},"BusinessCombinationAcquisitionRelatedCosts":{"label":"Business Combination, Acquisition Related Costs","description":"This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. 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Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"start":"2006-01-01","end":"2010-12-31","val":60000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2011-01-01","end":"2011-12-31","val":60000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06"},{"start":"2011-01-01","end":"2011-12-31","val":60000,"accn":"0001047469-14-001905","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2011"},{"start":"2005-01-01","end":"2012-12-31","val":60000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06"},{"start":"2006-01-01","end":"2013-12-31","val":60000,"accn":"0001047469-14-001905","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06"},{"start":"2006-01-01","end":"2013-12-31","val":60000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016"}]}},"ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts":{"label":"Extensions, Discoveries, Additions and Improved Recovery, Less Related Costs","description":"Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":15994000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":152973000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06"},{"start":"2011-01-01","end":"2011-12-31","val":152973000,"accn":"0001047469-14-001905","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":108438000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06"},{"start":"2012-01-01","end":"2012-12-31","val":108438000,"accn":"0001047469-14-001905","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06"},{"start":"2012-01-01","end":"2012-12-31","val":108438000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":52189000,"accn":"0001047469-14-001905","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06"},{"start":"2013-01-01","end":"2013-12-31","val":52189000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":40720000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2014-01-01","end":"2014-12-31","val":40720000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":2540000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2015"}]}},"FairValueInputsDiscountRate":{"label":"Fair Value Inputs, Discount Rate (Deprecated 2018-01-31)","description":"Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.","units":{"pure":[{"end":"2016-09-30","val":0.1,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreaseAssets":{"label":"Fresh-Start Adjustment, Increase (Decrease), Assets","description":"Total fresh-start adjustment to assets.","units":{"USD":[{"end":"2016-09-30","val":271555000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents":{"label":"Fresh-Start Adjustment, Increase (Decrease), Cash and Cash Equivalents","description":"Amount of fresh-start adjustment to cash and cash 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Investments","description":"Amount of fresh-start adjustment to investments.","units":{"USD":[{"end":"2016-09-30","val":134000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreaseLiabilities":{"label":"Fresh-Start Adjustment, Increase (Decrease), Liabilities","description":"Total fresh-start adjustment to liabilities.","units":{"USD":[{"end":"2016-09-30","val":180631000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreaseLiabilitiesAndStockholdersEquity":{"label":"Fresh-Start Adjustment, Increase (Decrease), Liabilities and Stockholders' Equity","description":"Total fresh-start adjustment to liabilities and stockholders' 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assets.","units":{"USD":[{"end":"2016-09-30","val":4739000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreasePropertyAndEquipmentNet":{"label":"Fresh-Start Adjustment, Increase (Decrease), Property and Equipment, Net","description":"Total fresh-start adjustment to property and equipment, net.","units":{"USD":[{"end":"2016-09-30","val":31107000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreaseReceivablesNet":{"label":"Fresh-Start Adjustment, Increase (Decrease), Receivables, Net","description":"Amount of fresh-start adjustment to receivables.","units":{"USD":[{"end":"2016-09-30","val":6573000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q3I"}]}},"FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit":{"label":"Fresh-Start Adjustment, 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reserves.","units":{"USD":[{"end":"2012-12-31","val":1836212000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1928019000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2013Q4I"},{"end":"2014-12-31","val":2510062000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"end":"2014-12-31","val":2510062000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2014Q4I"},{"end":"2015-12-31","val":862751000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2015Q4I"},{"end":"2016-12-31","val":354611000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q4I"}]}},"FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts":{"label":"Future Net Cash Flows Relating to Proved Oil and Gas 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reserves.","units":{"USD":[{"end":"2012-12-31","val":-303062000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012Q4I"},{"end":"2013-12-31","val":-314091000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2013Q4I"},{"end":"2014-12-31","val":-390057000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"end":"2014-12-31","val":390057000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2014Q4I"},{"end":"2015-12-31","val":180790000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2015Q4I"},{"end":"2016-12-31","val":66605000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q4I"}]}},"FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense":{"label":"Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Income Tax Expense","description":"Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of proved oil and gas reserves.","units":{"USD":[{"end":"2012-12-31","val":-105078000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012Q4I"},{"end":"2013-12-31","val":-82576000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2013Q4I"},{"end":"2014-12-31","val":-140458000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"end":"2014-12-31","val":140458000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2014Q4I"},{"end":"2016-12-31","val":0,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q4I"}]}},"FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows":{"label":"Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows","description":"Amount, after future accumulated cash outflow for development and production costs and future income tax, of estimated future accumulated cash inflow from the sale of proved oil and gas 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reserves.","units":{"USD":[{"end":"2012-12-31","val":-574959000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012Q4I"},{"end":"2013-12-31","val":-688056000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2013Q4I"},{"end":"2014-12-31","val":-967776000,"accn":"0001047469-15-001976","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"end":"2014-12-31","val":967776000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2014Q4I"},{"end":"2015-12-31","val":503702000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2015Q4I"},{"end":"2016-12-31","val":264246000,"accn":"0001193125-17-115676","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-07","frame":"CY2016Q4I"}]}},"FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows":{"label":"Future Net Cash 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Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. 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Equity before Treasury Stock","description":"Total amount of stockholders' equity (deficit) items including stock value, paid in capital, retained earnings and including equity attributable to noncontrolling interests and before deducting the carrying value of treasury 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Amount excludes temporary equity. Alternate caption for the concept is permanent equity.","units":{"USD":[{"end":"2010-12-31","val":150674000,"accn":"0001104659-11-045308","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2010Q4I"},{"end":"2011-06-30","val":159936000,"accn":"0001104659-11-045308","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"}]}},"StockIssuedDuringPeriodSharesNewIssues":{"label":"Stock Issued During Period, Shares, New Issues","description":"Number of new stock issued during the period.","units":{"shares":[{"start":"2009-10-22","end":"2009-10-23","val":11775000,"accn":"0001047469-13-002288","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-06"}]}},"StockIssuedDuringPeriodValueConversionOfConvertibleSecurities":{"label":"Stock Issued During Period, Value, Conversion of Convertible Securities","description":"The gross value of stock issued during the period upon the conversion of convertible securities.","units":{"USD":[{"start":"2015-01-01","end":"2015-12-31","val":2000000,"accn":"0001047469-16-011292","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-17","frame":"CY2015"}]}},"StockIssuedDuringPeriodValueNewIssues":{"label":"Stock Issued During Period, Value, New Issues","description":"Equity impact of the value of new stock issued during the period. 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