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Supplemental Oil And Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2012
Supplemental Oil and Gas Disclosures [Abstract] |
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure |
|  | 2012 |  | 2011 |
Unproved oil and gas properties | $ | 51,513 | $ | 50,389 |
Proved oil and gas properties |  | 2,453,667 |  | 2,516,363 |
Total oil and gas properties |  | 2,505,180 |  | 2,566,752 |
Accumulated depletion, depreciation and amortization |  | (1,717,314) |  | (1,695,105) |
Net capitalized costs | $ | 787,866 | $ | 871,647 |
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure |
|  | Year Ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Property acquisition costs: |  |  |  |  |  |  |
Proved properties | $ | - | $ | - | $ | - |
Unproved properties |  | - |  | 41 |  | 364 |
Total property acquisition costs |  | - |  | 41 |  | 364 |
Exploration costs |  | 135,311 |  | 2,513 |  | 1,362 |
Development costs (1) |  | 17,344 |  | 126,196 |  | 53,002 |
Asset retirement costs (2) |  | 59,715 |  | 46,446 |  | 25,356 |
Total costs incurred | $ | 212,370 | $ | 175,196 | $ | 80,084 |
(1) Development costs include costs incurred to obtain access to proved reserves to drill and equip development wells. (2) Asset retirement costs include $15.5 million, $20.0 million, $0.9 million, respectively, associated with the Camelot field in the United Kingdom during the years ended December 31, 2012, 2011 and 2010.
Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities |
|  |  |  |  |  | Total |
|  | Oil |  | Gas |  | (MBOE) |
Total proved reserves at December 31, 2009 (1) |  | 29,727 |  | 399,315 |  | 96,280 |
Revision of previous estimates (1), (2) |  | (1,555) |  | (144,954) |  | (25,714) |
Production |  | (3,354) |  | (27,097) |  | (7,870) |
Purchases of reserves in place |  | - |  | - |  | - |
Sales of reserves in place |  | - |  | - |  | - |
Extensions and discoveries |  | - |  | - |  | - |
Total proved reserves at December 31, 2010 |  | 24,818 |  | 227,264 |  | 62,696 |
Revision of previous estimates (3) |  | 3,475 |  | (108,947) |  | (14,683) |
Production |  | (5,785) |  | (17,458) |  | (8,694) |
Purchases of reserves in place |  | - |  | - |  | - |
Sales of reserves in place |  | (205) |  | (4,109) |  | (890) |
Extensions and discoveries |  | 386 |  | 271 |  | 431 |
Total proved reserves at December 31, 2011 |  | 22,689 |  | 97,021 |  | 38,860 |
Revision of previous estimates (4) |  | 647 |  | (12,926) |  | (1,508) |
Production |  | (4,725) |  | (11,361) |  | (6,619) |
Purchases of reserves in place |  | - |  | - |  | - |
Sales of reserves in place |  | (75) |  | (3,473) |  | (654) |
Extensions and discoveries |  | 1,434 |  | 4,026 |  | 2,105 |
Total proved reserves at December 31, 2012 |  | 19,970 |  | 73,287 |  | 32,184 |
Total proved developed reserves as of: |  |  |  |  |  |  |
December 31, 2009 |  | 14,850 |  | 124,763 |  | 35,644 |
December 31, 2010 |  | 11,796 |  | 75,664 |  | 24,407 |
December 31, 2011 |  | 12,754 |  | 59,859 |  | 22,731 |
December 31, 2012 |  | 12,431 |  | 43,475 |  | 19,677 |
(1) Total proved gas reserves at December 31, 2009 include 12 Bcf associated with the Camelot field in the United Kingdom. The U.K. reserves were reversed in 2010 as a result of our decision to no longer develop the field and to pursue its full abandonment. (2) Includes an approximate 1.8 MMBbls decrease in oil reserve and an approximate 131 Bcf decrease in gas reserve as reflected in our independent petroleum engineer reserve report at June 30, 2010 resulting from a combination of factors, including well performance issues at certain producing fields, most notably the Bushwood field at Garden Banks Blocks 462/463/506/507, as well as changes in the field economics of other oil and gas properties. The changes in field economics primarily affected properties that were either close to the end of their production life or in which we had proved undeveloped reserves, which would have been required to be developed in the near term. The decision not to develop these properties in light of these economic changes was also driven by our desire to pursue potential alternatives to divest all or a portion of our oil and gas assets and the increasing uncertainties about future oil and gas operations in the Gulf of Mexico as a result of the Macondo well control incident. (3) The positive revision in oil reserves reflects the better than expected production volumes primarily from the Phoenix field at Green Canyon Blocks 236, 237, 238 and 282 since it began production in October 2010. The d ecrease in gas reserve primarily represents a reclassification of estimate d proved reserves to the probable reserve category following the receipt and interpretation of new seismic data. The field with the largest shift from the proved to probable reserve category was the Bushwood field, where we reclassified approximately 87 Bcf at December 31, 2011. (4) Decrease primarily represents revision s at several gas fields due to well performance and future capital investment plans.
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure |
|  | United |  | United |  |  |
|  | States |  | Kingdom |  | Total |
As of December 31, 2012 — |  |  |  |  |  |  |
Future cash inflows | $ | 2,341,354 | $ | - | $ | 2,341,354 |
Future costs: |  |  |  |  |  |  |
Production |  | 509,408 |  | - |  | 509,408 |
Development and abandonment |  | 507,074 |  | 2,897 |  | 509,971 |
Total future costs |  | 1,016,482 |  | 2,897 |  | 1,019,379 |
Future net cash flows before income taxes |  | 1,324,872 |  | (2,897) |  | 1,321,975 |
Future income tax expense |  | 330,630 |  | - |  | 330,630 |
Future net cash flows |  | 994,242 |  | (2,897) |  | 991,345 |
Discount at 10% annual rate |  | 153,032 |  | - |  | 153,032 |
Standardized measure of discounted future net cash flows | $ | 841,210 | $ | (2,897) | $ | 838,313 |
As of December 31, 2011 — |  |  |  |  |  |  |
Future cash inflows | $ | 2,811,956 | $ | - | $ | 2,811,956 |
Future costs: |  |  |  |  |  |  |
Production |  | 419,617 |  | - |  | 419,617 |
Development and abandonment |  | 557,323 |  | 27,300 |  | 584,623 |
Total future costs |  | 976,940 |  | 27,300 |  | 1,004,240 |
Future net cash flows before income taxes |  | 1,835,016 |  | (27,300) |  | 1,807,716 |
Future income tax expense |  | 477,630 |  | - |  | 477,630 |
Future net cash flows |  | 1,357,386 |  | (27,300) |  | 1,330,086 |
Discount at 10% annual rate |  | 266,954 |  | - |  | 266,954 |
Standardized measure of discounted future net cash flows | $ | 1,090,432 | $ | (27,300) | $ | 1,063,132 |
As of December 31, 2010 — |  |  |  |  |  |  |
Future cash inflows | $ | 2,925,744 | $ | - | $ | 2,925,744 |
Future costs: |  |  |  |  |  |  |
Production |  | 583,050 |  | - |  | 583,050 |
Development and abandonment |  | 590,870 |  | 12,200 |  | 603,070 |
Total future costs |  | 1,173,920 |  | 12,200 |  | 1,186,120 |
Future net cash flows before income taxes |  | 1,751,824 |  | (12,200) |  | 1,739,624 |
Future income tax expense |  | 430,153 |  | - |  | 430,153 |
Future net cash flows |  | 1,321,671 |  | (12,200) |  | 1,309,471 |
Discount at 10% annual rate |  | 318,404 |  | - |  | 318,404 |
Standardized measure of discounted future net cash flows | $ | 1,003,267 | $ | (12,200) | $ | 991,067 |
Schedule Of Average Price Used To Estimate Proved Oil And Gas Reserves |
|  | Year Ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Oil price per Bbl | $ | 104.85 | $ | 105.35 | $ | 77.55 |
Natural gas price per Mcf | $ | 3.38 | $ | 4.34 | $ | 4.40 |
Changes In Standardized Measure Of Discounted Future Net Cash Flows |
|  | Year Ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Standardized measure, beginning of year | $ | 1,063,132 | $ | 991,067 | $ | 991,060 |
Changes during the year: |  |  |  |  |  |  |
Sales, net of production costs |  | (379,910) |  | (516,895) |  | (294,212) |
Net change in prices and production costs |  | (242,037) |  | 414,426 |  | 577,687 |
Changes in future development costs |  | (65,854) |  | (108,007) |  | 84,907 |
Development costs incurred (1) |  | 149,702 |  | 168,005 |  | 55,646 |
Accretion of discount |  | 147,157 |  | 131,464 |  | 129,083 |
Net change in income taxes |  | 101,720 |  | (54,613) |  | (41,115) |
Purchases of reserves in place |  | - |  | - |  | - |
Extensions and discoveries |  | 110,655 |  | 29,479 |  | - |
Sales of reserves in place |  | (6,096) |  | (14,324) |  | - |
Net change due to revision in quantity estimates |  | 28,627 |  | (186,197) |  | (422,987) |
Changes in production rates (timing) and other |  | (68,783) |  | 208,727 |  | (89,002) |
Total |  | (224,819) |  | 72,065 |  | 7 |
Standardized measure, end of year | $ | 838,313 | $ | 1,063,132 | $ | 991,067 |

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- Definition Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59P, 59Q, 59R -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63042-109448 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62059-109447 + Details
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- Definition Tabular disclosure of the net quantities of an enterprise's interests in proved developed and undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period as of the beginning of the period, changes in quantities during the period, and as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61872-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61858-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61869-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59E, 59F, 59G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 36 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62536-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62476-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62479-109447 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59Y, 59Z, 59AA, 59BB, 59CC -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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