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Supplemental Information on Oil and Natural Gas Producing Activities (Tables) | 12 Months Ended
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Dec. 31, 2012
Extractive Industries [Abstract] |
Capitalized Costs Relating to Oil and Natural Gas Producing Activities | Capitalized Costs Related to Oil and Natural Gas Producing Activities The Company’s capitalized costs for oil and natural gas activities consisted of the following (in thousands):
| December 31,
| 2012 |  | 2011 |  | 2010
Oil and natural gas properties |  |  |  |  |
Proved | $ | 12,262,921 |  |  | $ | 8,969,296 |  |  | $ | 8,159,924 |
Unproved | 865,863 |  |  | 689,393 |  |  | 547,953 |
Total oil and natural gas properties | 13,128,784 |  |  | 9,658,689 |  |  | 8,707,877 |
Less accumulated depreciation, depletion and impairment | (5,231,182 | ) |  | (4,791,534 | ) |  | (4,483,736 | )
Net oil and natural gas properties capitalized costs | $ | 7,897,602 |  |  | $ | 4,867,155 |  |  | $ | 4,224,141 |
Cost Incurred in Oil and Natural Gas Property Acquisition, Exploration, and Development | Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Costs incurred in oil and natural gas property acquisition, exploration and development activities which have been capitalized are summarized as follows (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Acquisitions of properties |  |  |  |  |
Proved | $ | 1,761,556 |  |  | $ | 58,190 |  |  | $ | 1,346,303 |
Unproved | 377,185 |  |  | 320,361 |  |  | 352,648 |
Exploration(1) | 120,438 |  |  | 98,849 |  |  | 31,717 |
Development(2) | 1,704,991 |  |  | 1,296,903 |  |  | 1,006,232 |
Total cost incurred | $ | 3,964,170 |  |  | $ | 1,774,303 |  |  | $ | 2,736,900 |
____________________
(1) | Includes seismic costs of $15.3 million, $4.9 million and $4.1 million for 2012, 2011 and 2010, respectively.
(2) | Includes loss on the construction of the Century Plant of $50.0 million, $25.0 million and $105.0 million for 2012, 2011 and 2010, respectively. See Note 12.
Results of Operations for Oil and Natural Gas Producing Activities (Unaudited) | Results of Operations for Oil and Natural Gas Producing Activities (Unaudited) The Company’s results of operations from oil and natural gas producing activities for each of the years 2012, 2011 and 2010 are shown in the following table (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Revenues | $ | 1,759,282 |  |  | $ | 1,226,794 |  |  | $ | 774,763 |
Expenses |  |  |  |  |
Production costs | 524,364 |  |  | 368,946 |  |  | 267,033 |
Depreciation and depletion | 568,029 |  |  | 317,246 |  |  | 265,914 |
Accretion of asset retirement obligations | 28,996 |  |  | 9,368 |  |  | 9,421 |
Total expenses | 1,121,389 |  |  | 695,560 |  |  | 542,368 |
Income before income taxes | 637,893 |  |  | 531,234 |  |  | 232,395 |
Benefit of income taxes(1) | (437,595 | ) |  | (20,134 | ) |  | (405,413 | )
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) | $ | 1,075,488 |  |  | $ | 551,368 |  |  | $ | 637,808 |
____________________
(1) | Reflects the Company’s effective tax rate, including the partial valuation allowance release.
Summary of Changes in Estimated Oil and Natural Gas Reserves (Unaudited) | The summary below presents changes in the Company’s estimated reserves for 2010, 2011 and 2012.
| Oil |  | Natural Gas
| (MBbls) |  | (MMcf)(1)
Proved developed and undeveloped reserves |  |  |
As of December 31, 2009 | 105,349 |  |  | 680,075 |
Revisions of previous estimates | 12,999 |  |  | 867,931 |
Acquisitions of new reserves | 71,640 |  |  | 79,942 |
Extensions and discoveries | 69,512 |  |  | 211,150 |
Sales of reserves in place | — |  |  | (207 | )
Production | (7,386 | ) |  | (76,226 | )
As of December 31, 2010 | 252,114 |  |  | 1,762,665 |
Revisions of previous estimates | (9,278 | ) |  | (164,845 | )
Acquisitions of new reserves | 1,533 |  |  | 2,906 |
Extensions and discoveries | 55,577 |  |  | 299,848 |
Sales of reserves in place | (43,331 | ) |  | (476,212 | )
Production | (11,830 | ) |  | (69,306 | )
As of December 31, 2011(3) | 244,785 |  |  | 1,355,056 |
Proved developed reserves |  |  |
As of December 31, 2009 | 38,327 |  |  | 592,777 |
As of December 31, 2010 | 91,965 |  |  | 784,292 |
As of December 31, 2011 | 118,728 |  |  | 670,382 |
Proved undeveloped reserves |  |  |
As of December 31, 2009 | 67,022 |  |  | 87,298 |
As of December 31, 2010 | 160,149 |  |  | 978,373 |
As of December 31, 2011 | 126,057 |  |  | 684,674 |
| Oil |  | NGLs |  | Natural Gas
| (MBbls) |  | (MBbls)(2) |  | (MMcf)(1)
Proved developed and undeveloped reserves |  |  |  |  |
As of December 31, 2011(3) | 214,450 |  |  | 30,335 |  |  | 1,355,056 |
Revisions of previous estimates | (37,394 | ) |  | 15,098 |  |  | (538,214 | )
Acquisitions of new reserves | 31,470 |  |  | 683 |  |  | 202,995 |
Extensions and discoveries | 89,656 |  |  | 27,259 |  |  | 489,302 |
Sales of reserves in place | (20,269 | ) |  | (3,287 | ) |  | (548 | )
Production | (15,868 | ) |  | (2,094 | ) |  | (93,549 | )
As of December 31, 2012(3) | 262,045 |  |  | 67,994 |  |  | 1,415,042 |
Proved developed reserves of December 31, 2012 | 136,605 |  |  | 33,785 |  |  | 896,701 |
Proved undeveloped reserves of December 31, 2012 | 125,440 |  |  | 34,209 |  |  | 518,341 |
____________________
(1) | Natural gas reserves are computed at 14.65 pounds per square inch absolute and 60 degrees Fahrenheit.
(2) | Prior to 2012, NGLs did not comprise a significant portion of total proved reserves and were included with oil reserves, which affects the comparability of estimated reserves for 2012, 2011 and 2010.
(3) | Proved reserves at December 31, 2012 and 2011, respectively, include approximately 17,340 MBbls and 17,018 MBbls of oil, 5,132 MBbls and 1,782 MBbls of NGLs and 94,543 MMcf and 45,500 MMcf of natural gas attributable to noncontrolling interests.
Calculation of Weighted Average Per Unit Prices (Unaudited) | The calculated weighted average per unit prices for the Company’s proved reserves and future net revenues were as follows:
| At December 31,
| 2012 |  | 2011 |  | 2010
Oil (per barrel) | $ | 91.65 |  |  | $ | 85.77 |  |  | $ | 66.93 |
Natural gas (per Mcf) | $ | 2.29 |  |  | $ | 4.06 |  |  | $ | 3.80 |
Standardized Measure of Discounted Future Cash Flows (Unaudited) | The summary below presents the Company’s future net cash flows relating to proved oil and natural gas reserves based on the standardized measure in ASC Topic 932 (in thousands).
| At December 31,
| 2012 |  | 2011 |  | 2010
Future cash inflows from production | $ | 29,482,544 |  |  | $ | 26,494,942 |  |  | $ | 23,564,771 |
Future production costs | (8,899,465 | ) |  | (7,392,104 | ) |  | (8,218,860 | )
Future development costs(1) | (4,021,051 | ) |  | (2,977,993 | ) |  | (3,779,761 | )
Future income tax expenses | (3,721,509 | ) |  | (4,043,953 | ) |  | (2,392,464 | )
Undiscounted future net cash flows | 12,840,519 |  |  | 12,080,892 |  |  | 9,173,686 |
10% annual discount | (7,000,151 | ) |  | (6,864,555 | ) |  | (5,490,171 | )
Standardized measure of discounted future net cash flows(2) | $ | 5,840,368 |  |  | $ | 5,216,337 |  |  | $ | 3,683,515 |
____________________
(1) | Includes abandonment costs.
(2) | Includes approximately $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2012 and 2011, respectively.
Estimate of Changes in Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves (Unaudited) | The following table represents the Company’s estimate of changes in the standardized measure of discounted future net cash flows from proved reserves (in thousands):
Present value as of December 31, 2009 | $ | 1,560,978 |
Changes during the year |
Revenues less production and other costs | (507,730 | )
Net changes in prices, production and other costs | 967,967 |
Development costs incurred | 366,539 |
Net changes in future development costs | (910,934 | )
Extensions and discoveries | 955,540 |
Revisions of previous quantity estimates | 773,132 |
Accretion of discount | 159,971 |
Net change in income taxes | (825,668 | )
Purchases of reserves in-place | 1,133,413 |
Sales of reserves in-place | (258 | )
Timing differences and other(1) | 10,565 |
Net change for the year | 2,122,537 |
Present value as of December 31, 2010 | 3,683,515 |
Changes during the year |
Revenues less production and other costs | (857,848 | )
Net changes in prices, production and other costs | 1,264,736 |
Development costs incurred | 575,546 |
Net changes in future development costs | 87,080 |
Extensions and discoveries | 1,812,167 |
Revisions of previous quantity estimates | (345,965 | )
Accretion of discount | 455,501 |
Net change in income taxes | (833,841 | )
Purchases of reserves in-place | 44,934 |
Sales of reserves in-place | (558,257 | )
Timing differences and other(1) | (111,231 | )
Net change for the year | 1,532,822 |
Present value as of December 31, 2011(2) | 5,216,337 |
Changes during the year |
Revenues less production and other costs | (1,234,918 | )
Net changes in prices, production and other costs | (2,555,391 | )
Development costs incurred | 766,943 |
Net changes in future development costs | (45,397 | )
Extensions and discoveries | 2,092,423 |
Revisions of previous quantity estimates | (530,755 | )
Accretion of discount | 678,200 |
Net change in income taxes | 11,433 |
Purchases of reserves in-place | 1,708,301 |
Sales of reserves in-place | (410,415 | )
Timing differences and other(1) | 143,607 |
Net change for the year | 624,031 |
Present value as of December 31, 2012(2) | $ | 5,840,368 |
____________________
(1) | The change in timing differences and other are related to revisions in the Company’s estimated time of production and development.
(2) | Includes approximately $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2012 and 2011, respectively.

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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 results of operations for oil and gas producing activities for the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62094-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59S, 59T, 59U, 59V, 59W, 59X -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63071-109448 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62352-109447 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62395-109447 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62259-109447 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(17)(ii),(c)(3)(ii)(A)(1)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 + 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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