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2017-01-01","end":"2017-03-31","val":77000,"accn":"0000316300-17-000012","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":100000,"accn":"0000316300-17-000027","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08"},{"start":"2017-01-01","end":"2017-09-30","val":101000,"accn":"0000316300-17-000038","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07"},{"start":"2017-01-01","end":"2017-12-31","val":175000,"accn":"0000316300-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15"},{"start":"2017-01-01","end":"2017-12-31","val":175000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":7000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":47000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":77000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"start":"2018-01-01","end":"2018-12-31","val":77000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2018"}]}},"AssetRetirementObligationRevisionOfEstimate":{"label":"Asset 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0-Q","filed":"2013-08-07"},{"start":"2013-01-01","end":"2013-06-30","val":34798000,"accn":"0000316300-14-000039","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-30"},{"start":"2013-01-01","end":"2013-09-30","val":-12151000,"accn":"0000316300-13-000076","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-30"},{"start":"2013-01-01","end":"2013-09-30","val":-12151000,"accn":"0000316300-14-000052","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-29"},{"start":"2013-01-01","end":"2013-12-31","val":4839000,"accn":"0000316300-14-000010","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"start":"2013-01-01","end":"2013-12-31","val":4839000,"accn":"0000316300-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"start":"2013-01-01","end":"2013-12-31","val":4839000,"accn":"0000316300-16-000087","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-02","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":44029000,"accn":"0000316300-14-000023","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-30"},{"start":"2014-01-01","end":"2014-03-31","val":44029000,"accn":"0000316300-15-000016","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-4605000,"accn":"0000316300-14-000039","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-30"},{"start":"2014-01-01","end":"2014-06-30","val":-4605000,"accn":"0000316300-15-000030","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-27"},{"start":"2014-01-01","end":"2014-09-30","val":-2533000,"accn":"0000316300-14-000052","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-29"},{"start":"2014-01-01","end":"2014-09-30","val":-2533000,"accn":"0000316300-15-000040","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28"},{"start":"2014-01-01","end":"2014-12-31","val":-4178000,"accn":"0000316300-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"start":"2014-01-01","end":"2014-12-31","val":-4178000,"accn":"0000316300-16-000087","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-02"},{"start":"2014-01-01","end":"2014-12-31","val":-4178000,"accn":"0000316300-17-000007","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-20658000,"accn":"0000316300-15-000016","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29"},{"start":"2015-01-01","end":"2015-03-31","val":-20658000,"accn":"0000316300-16-000102","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":3602000,"accn":"0000316300-15-000030","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-27"},{"start":"2015-01-01","end":"2015-06-30","val":3602000,"accn":"0000316300-16-000117","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-03"},{"start":"2015-01-01","end":"2015-09-30","val":-25794000,"accn":"0000316300-15-000040","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28"},{"start":"2015-01-01","end":"2015-09-30","val":-25794000,"accn":"0000316300-16-000122","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-02"},{"start":"2015-01-01","end":"2015-12-31","val":-34058000,"accn":"0000316300-16-000087","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-02"},{"start":"2015-01-01","end":"2015-12-31","val":-34058000,"accn":"0000316300-17-000007","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16"},{"start":"2015-01-01","end":"2015-12-31","val":-34058000,"accn":"0000316300-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":33969000,"accn":"0000316300-16-000102","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04"},{"start":"2016-01-01","end":"2016-03-31","val":33969000,"accn":"0000316300-17-000012","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":15316000,"accn":"0000316300-16-000117","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-03"},{"start":"2016-01-01","end":"2016-06-30","val":15316000,"accn":"0000316300-17-000027","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08"},{"start":"2016-01-01","end":"2016-09-30","val":-8713000,"accn":"0000316300-16-000122","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-02"},{"start":"2016-01-01","end":"2016-09-30","val":-8713000,"accn":"0000316300-17-000038","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07"},{"start":"2016-01-01","end":"2016-12-31","val":-3179000,"accn":"0000316300-17-000007","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16"},{"start":"2016-01-01","end":"2016-12-31","val":-3179000,"accn":"0000316300-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":22961000,"accn":"0000316300-17-000012","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":306000,"accn":"0000316300-17-000027","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08"}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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2016-12-31","val":20218000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2016-12-31","val":20218000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2016-12-31","val":20218000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"end":"2016-12-31","val":20218000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2016Q4I"},{"end":"2017-03-31","val":47624000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":31255000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":105838000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13","frame":"CY2017Q3I"},{"end":"2017-12-31","val":54868000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2017-12-31","val":54868000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":54868000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"end":"2017-12-31","val":54868000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2017Q4I"},{"end":"2018-03-31","val":75662000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":65979000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":73991000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13","frame":"CY2018Q3I"},{"end":"2018-12-31","val":62590000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect","description":"Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":27406000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":11037000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":85620000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"start":"2017-01-01","end":"2017-12-31","val":34650000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":20794000,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":11111000,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":19123000,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"start":"2018-01-01","end":"2018-12-31","val":7722000,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2018"}]}},"CashPaidForCapitalizedInterest":{"label":"Cash Paid for Capitalized Interest (Deprecated 2011-01-31)","description":"The amount of cash paid during the current period for interest owed on money borrowed that is not charged as an expense but rather is capitalized based on the long term nature of the use of the borrowed funds.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":3861000,"accn":"0001193125-11-045326","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-24","frame":"CY2008"},{"start":"2009-01-01","end":"2009-06-30","val":2797000,"accn":"0001193125-10-176841","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2009-01-01","end":"2009-09-30","val":3937000,"accn":"0001193125-10-245919","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2009-01-01","end":"2009-12-31","val":5840000,"accn":"0001193125-11-045326","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":2915000,"accn":"0001193125-11-125945","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-04","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":6114000,"accn":"0001193125-10-176841","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2010-01-01","end":"2010-09-30","val":12709000,"accn":"0001193125-10-245919","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2010-01-01","end":"2010-12-31","val":20829000,"accn":"0001193125-11-045326","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":7740000,"accn":"0001193125-11-125945","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-04","frame":"CY2011Q1"}]}},"ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1":{"label":"Class of Warrant or Right, Exercise Price of Warrants or Rights","description":"Exercise price per share or per unit of warrants or rights outstanding.","units":{"USD/shares":[{"end":"2017-03-31","val":0.01,"accn":"0000316300-17-000012","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2017Q1I"},{"end":"2017-06-30","val":0.01,"accn":"0000316300-17-000027","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08","frame":"CY2017Q2I"},{"end":"2017-09-30","val":0.01,"accn":"0000316300-17-000038","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0.01,"accn":"0000316300-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15","frame":"CY2017Q4I"},{"end":"2018-03-31","val":0.01,"accn":"0000316300-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0.01,"accn":"0000316300-18-000017","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0.01,"accn":"0000316300-18-000020","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0.01,"accn":"0000316300-19-000002","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2018Q4I"}]}},"ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights":{"label":"Class of Warrant or Right, Number of Securities Called by Warrants or Rights","description":"Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.","units":{"shares":[{"end":"2013-12-19","val":0.25,"accn":"0000316300-14-000010","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-19","val":0.25,"accn":"0000316300-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2013-12-19","val":0.25,"accn":"0000316300-16-000087","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-02"},{"end":"2013-12-19","val":0.25,"accn":"0000316300-17-000007","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2013Q4I"},{"end":"2014-03-31","val":0.25,"accn":"0000316300-14-000023","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-30","frame":"CY2014Q1I"}]}},"ClassOfWarrantOrRightOutstanding":{"label":"Class of Warrant or Right, Outstanding","description":"Number of warrants or rights 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