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Supplemental Information on Oil and Natural Gas Producing Activities (Tables) | 12 Months Ended
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Dec. 31, 2014
Reserve Quantities [Line Items] |
Capitalized Costs Relating to Oil, Natural Gas and NGL 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,
| 2014 |  | 2013 |  | 2012
Oil and natural gas properties |  |  |  |  |
Proved | $ | 11,707,147 |  |  | $ | 10,972,816 |  |  | $ | 12,262,921 |
Unproved | 290,596 |  |  | 531,606 |  |  | 865,863 |
Total oil and natural gas properties | 11,997,743 |  |  | 11,504,422 |  |  | 13,128,784 |
Less accumulated depreciation, depletion and impairment | (6,359,149 | ) |  | (5,762,969 | ) |  | (5,231,182 | )
Net oil and natural gas properties capitalized costs | $ | 5,638,594 |  |  | $ | 5,741,453 |  |  | $ | 7,897,602 |
Cost 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,
| 2014 |  | 2013 |  | 2012
Acquisitions of properties |  |  |  |  |
Proved | $ | 73,370 |  |  | $ | 21,130 |  |  | $ | 1,761,556 |
Unproved | 123,649 |  |  | 100,242 |  |  | 377,185 |
Exploration(1) | 41,070 |  |  | 82,775 |  |  | 120,438 |
Development(2) | 1,288,395 |  |  | 1,131,269 |  |  | 1,704,991 |
Total cost incurred | $ | 1,526,484 |  |  | $ | 1,335,416 |  |  | $ | 3,964,170 |
____________________
(1) | Includes seismic costs of $10.8 million, $6.7 million and $15.3 million for 2014, 2013 and 2012, respectively.
(2) | Includes the Company’s share of Century Plant construction costs of $50.0 million for 2012. See Note 7.
Results of Operations for Oil, Natural Gas and NGL Producing Activities | The Company’s results of operations from oil and natural gas producing activities for each of the years 2014, 2013 and 2012 are shown in the following table (in thousands):
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Revenues | $ | 1,420,879 |  |  | $ | 1,820,278 |  |  | $ | 1,759,282 |
Expenses |  |  |  |  |
Production costs | 377,819 |  |  | 548,719 |  |  | 524,364 |
Depreciation and depletion | 434,295 |  |  | 567,732 |  |  | 568,029 |
Accretion of asset retirement obligations | 9,092 |  |  | 36,777 |  |  | 28,996 |
Total expenses | 821,206 |  |  | 1,153,228 |  |  | 1,121,389 |
Income before income taxes | 599,673 |  |  | 667,050 |  |  | 637,893 |
Benefit of income taxes(1) | (3,933 | ) |  | (7,471 | ) |  | (437,595 | )
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) | $ | 603,606 |  |  | $ | 674,521 |  |  | $ | 1,075,488 |
____________________
(1) | Reflects the Company’s effective tax rate, including the partial valuation allowance releases.
Summary of Changes in Estimated Oil, Natural Gas and NGL Reserves | The summary below presents changes in the Company’s estimated reserves for 2012, 2013 and 2014.
| Oil |  | NGL |  | Natural Gas
| (MBbls) |  | (MBbls) |  | (MMcf)(1)
Proved developed and undeveloped reserves |  |  |  |  |
As of December 31, 2011 | 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(2) | 262,045 |  |  | 67,994 |  |  | 1,415,042 |
Revisions of previous estimates | (13,969 | ) |  | 3,717 |  |  | (53,432 | )
Acquisitions of new reserves | 43 |  |  | 13 |  |  | 363 |
Extensions and discoveries | 40,570 |  |  | 18,686 |  |  | 359,918 |
Sales of reserves in place | (131,769 | ) |  | (29,067 | ) |  | (228,229 | )
Production | (14,279 | ) |  | (2,291 | ) |  | (103,233 | )
As of December 31, 2013(2) | 142,641 |  |  | 59,052 |  |  | 1,390,429 |
Revisions of previous estimates | (18,687 | ) |  | 11,103 |  |  | 167,589 |
Acquisitions of new reserves | 1,009 |  |  | 441 |  |  | 12,527 |
Extensions and discoveries | 37,603 |  |  | 27,500 |  |  | 467,185 |
Sales of reserves in place | (25,659 | ) |  | (2,516 | ) |  | (163,800 | )
Production | (10,876 | ) |  | (3,794 | ) |  | (85,697 | )
As of December 31, 2014(2) | 126,031 |  |  | 91,786 |  |  | 1,788,233 |
Proved developed reserves |  |  |  |  |
As of December 31, 2011 | 101,578 |  |  | 17,150 |  |  | 670,382 |
As of December 31, 2012 | 136,605 |  |  | 33,785 |  |  | 896,701 |
As of December 31, 2013 | 83,893 |  |  | 35,807 |  |  | 951,609 |
As of December 31, 2014 | 79,022 |  |  | 56,823 |  |  | 1,203,447 |
Proved undeveloped reserves |  |  |  |  |
As of December 31, 2011 | 112,872 |  |  | 13,185 |  |  | 684,674 |
As of December 31, 2012 | 125,440 |  |  | 34,209 |  |  | 518,341 |
As of December 31, 2013 | 58,748 |  |  | 23,245 |  |  | 438,820 |
As of December 31, 2014 | 47,009 |  |  | 34,963 |  |  | 584,786 |
____________________
(1) | Natural gas reserves are computed at 14.65 pounds per square inch absolute and 60 degrees Fahrenheit.
(2) | Includes proved reserves attributable to noncontrolling interests at December 31, 2014, 2013 and 2012 as shown in the table below:
| December 31,
| 2014 |  | 2013 |  | 2012
Oil (MBbl) | 11,027 |  |  | 13,569 |  |  | 17,340 |
NGL (MBbl) | 4,761 |  |  | 4,737 |  |  | 5,132 |
Natural gas (MMcf) | 70,833 |  |  | 69,693 |  |  | 94,543 |
Calculation of Weighted Average Per Unit Prices | The calculated weighted average per unit prices for the Company’s proved reserves and future net revenues were as follows:
| At December 31,
| 2014 |  | 2013 |  | 2012
Oil (per barrel) | $ | 91.65 |  |  | $ | 95.67 |  |  | $ | 91.65 |
NGL (per barrel) | $ | 32.79 |  |  | $ | 31.40 |  |  | $ | 32.64 |
Natural gas (per Mcf) | $ | 3.61 |  |  | $ | 3.65 |  |  | $ | 2.29 |
Standardized Measure of Discounted Future Cash Flows | The summary below presents the Company’s future net cash flows relating to proved oil, natural gas and NGL reserves based on the standardized measure in ASC Topic 932 (in thousands).
| At December 31,
| 2014 |  | 2013 |  | 2012
Future cash inflows from production | $ | 21,022,320 |  |  | $ | 19,937,484 |  |  | $ | 29,482,544 |
Future production costs | (6,499,366 | ) |  | (6,843,713 | ) |  | (8,899,465 | )
Future development costs(1) | (1,810,201 | ) |  | (2,546,680 | ) |  | (4,021,051 | )
Future income tax expenses | (3,223,740 | ) |  | (2,283,541 | ) |  | (3,721,509 | )
Undiscounted future net cash flows | 9,489,013 |  |  | 8,263,550 |  |  | 12,840,519 |
10% annual discount | (5,401,261 | ) |  | (4,245,939 | ) |  | (7,000,151 | )
Standardized measure of discounted future net cash flows(2) | $ | 4,087,752 |  |  | $ | 4,017,611 |  |  | $ | 5,840,368 |
____________________
(1) | Includes abandonment costs.
(2) | Includes approximately $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013 and 2012 respectively.
Estimate of Changes in Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves | 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, 2011 | $ | 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 |
Changes during the year |
Revenues less production and other costs | (1,271,559 | )
Net changes in prices, production and other costs | 271,566 |
Development costs incurred | 474,275 |
Net changes in future development costs | (207,729 | )
Extensions and discoveries | 1,406,102 |
Revisions of previous quantity estimates | (296,418 | )
Accretion of discount | 711,385 |
Net change in income taxes | 477,328 |
Purchases of reserves in-place | 1,628 |
Sales of reserves in-place | (3,172,187 | )
Timing differences and other(1) | (217,148 | )
Net change for the year | (1,822,757 | )
Present value as of December 31, 2013(2) | 4,017,611 |
Changes during the year |
Revenues less production and other costs | (1,043,060 | )
Net changes in prices, production and other costs | 331,694 |
Development costs incurred | 364,262 |
Net changes in future development costs | (341,183 | )
Extensions and discoveries | 1,785,963 |
Revisions of previous quantity estimates | (77,688 | )
Accretion of discount | 477,458 |
Net change in income taxes | (256,371 | )
Purchases of reserves in-place | 50,958 |
Sales of reserves in-place | (1,058,330 | )
Timing differences and other(1) | (163,562 | )
Net change for the year | 70,141 |
Present value as of December 31, 2014(2) | $ | 4,087,752 |
____________________
(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 $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013, and 2012 respectively.
Noncontrolling Interest |
Reserve Quantities [Line Items] |
Summary of Changes in Estimated Oil, Natural Gas and NGL Reserves |
| Includes proved reserves attributable to noncontrolling interests at December 31, 2014, 2013 and 2012 as shown in the table below:
| December 31,
| 2014 |  | 2013 |  | 2012
Oil (MBbl) | 11,027 |  |  | 13,569 |  |  | 17,340 |
NGL (MBbl) | 4,761 |  |  | 4,737 |  |  | 5,132 |
Natural gas (MMcf) | 70,833 |  |  | 69,693 |  |  | 94,543 |

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