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Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. 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Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).","units":{"bbl":[{"end":"2011-12-31","val":0,"accn":"0001140361-12-048979","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-29","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0001140361-12-048789","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-11-27"},{"end":"2012-06-30","val":0,"accn":"0001140361-12-048789","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-11-27","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0001140361-12-048979","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-29","frame":"CY2012Q3I"}]}},"RepaymentsOfDebt":{"label":"Repayments of Debt","description":"The cash outflow during the period from the repayment of aggregate short-term and long-term debt. 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