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Supplemental Information on Oil and Natural Gas Producing Activities (Tables) | 12 Months Ended
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Dec. 31, 2015
Reserve Quantities [Line Items] |
Capitalized Costs Relating to Oil, Natural Gas and NGL Producing Activities | The Company’s capitalized costs for oil and natural gas activities consisted of the following (in thousands):
| December 31,
| 2015 |  | 2014 |  | 2013
Oil and natural gas properties |  |  |  |  |
Proved | $ | 12,529,681 |  |  | $ | 11,707,147 |  |  | $ | 10,972,816 |
Unproved | 363,149 |  |  | 290,596 |  |  | 531,606 |
Total oil and natural gas properties | 12,892,830 |  |  | 11,997,743 |  |  | 11,504,422 |
Less accumulated depreciation, depletion and impairment | (11,149,888 | ) |  | (6,359,149 | ) |  | (5,762,969 | )
Net oil and natural gas properties capitalized costs | $ | 1,742,942 |  |  | $ | 5,638,594 |  |  | $ | 5,741,453 |
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,
| 2015 |  | 2014 |  | 2013
Acquisitions of properties |  |  |  |  |
Proved | $ | 35,376 |  |  | $ | 73,370 |  |  | $ | 21,130 |
Unproved | 210,065 |  |  | 123,649 |  |  | 100,242 |
Exploration(1) | 29,297 |  |  | 41,070 |  |  | 82,775 |
Development | 571,562 |  |  | 1,288,395 |  |  | 1,131,269 |
Total cost incurred | $ | 846,300 |  |  | $ | 1,526,484 |  |  | $ | 1,335,416 |
____________________
(1) | Includes seismic costs of $7.1 million, $10.8 million and $6.7 million for 2015, 2014 and 2013, respectively.
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 2015, 2014 and 2013 are shown in the following table (in thousands):
| Year Ended December 31,
| 2015 |  | 2014(1) |  | 2013
Revenues | $ | 707,434 |  |  | $ | 1,420,879 |  |  | $ | 1,820,278 |
Expenses |  |  |  |  |
Production costs | 324,141 |  |  | 377,819 |  |  | 548,719 |
Depreciation and depletion | 319,913 |  |  | 434,295 |  |  | 567,732 |
Accretion of asset retirement obligations | 4,477 |  |  | 9,092 |  |  | 36,777 |
Impairment | 4,473,787 |  |  | 164,779 |  |  | — |
Total expenses | 5,122,318 |  |  | 985,985 |  |  | 1,153,228 |
(Loss) income before income taxes | (4,414,884 | ) |  | 434,894 |  |  | 667,050 |
Income tax expense (benefit)(2) | 126 |  |  | (2,852 | ) |  | (7,471 | )
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) | $ | (4,415,010 | ) |  | $ | 437,746 |  |  | $ | 674,521 |
____________________
(1) | Total expenses increased by $164.8 million and benefit of income taxes decreased by $1.1 million to correctly include the impact of the ceiling test impairment incurred during the year ended December 31, 2014.
(2) | Reflects the Company’s effective tax rate for each period.
Summary of Changes in Estimated Oil, Natural Gas and NGL Reserves | The summary below presents changes in the Company’s estimated reserves for 2013, 2014 and 2015.
| Oil |  | NGL |  | Natural Gas
| (MBbls) |  | (MBbls) |  | (MMcf)(1)
Proved developed and undeveloped reserves |  |  |  |  |
As of December 31, 2012 | 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 |
Revisions of previous estimates | (70,708 | ) |  | (37,384 | ) |  | (759,106 | )
Acquisitions of new reserves | 22,447 |  |  | 2,460 |  |  | 15,952 |
Extensions and discoveries | 9,741 |  |  | 9,257 |  |  | 160,865 |
Production | (9,600 | ) |  | (5,044 | ) |  | (92,104 | )
As of December 31, 2015(2) | 77,911 |  |  | 61,075 |  |  | 1,113,840 |
Proved developed reserves |  |  |  |  |
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 |
As of December 31, 2015 | 48,639 |  |  | 51,089 |  |  | 964,617 |
Proved undeveloped reserves |  |  |  |  |
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 |
As of December 31, 2015 | 29,272 |  |  | 9,986 |  |  | 149,223 |
____________________
(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, 2015, 2014 and 2013 as shown in the table below:
| December 31,
| 2015 |  | 2014 |  | 2013
Oil (MBbl) | 7,004 |  |  | 11,027 |  |  | 13,569 |
NGL (MBbl) | 3,694 |  |  | 4,761 |  |  | 4,737 |
Natural gas (MMcf) | 50,508 |  |  | 70,833 |  |  | 69,693 |
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,
| 2015 |  | 2014 |  | 2013
Oil (per barrel) | $ | 45.29 |  |  | $ | 91.65 |  |  | $ | 95.67 |
NGL (per barrel) | $ | 12.68 |  |  | $ | 32.79 |  |  | $ | 31.40 |
Natural gas (per Mcf) | $ | 1.87 |  |  | $ | 3.61 |  |  | $ | 3.65 |
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,
| 2015 |  | 2014 |  | 2013
Future cash inflows from production | $ | 6,387,944 |  |  | $ | 21,022,320 |  |  | $ | 19,937,484 |
Future production costs | (2,731,542 | ) |  | (6,499,366 | ) |  | (6,843,713 | )
Future development costs(1) | (838,945 | ) |  | (1,810,201 | ) |  | (2,546,680 | )
Future income tax expenses | (901 | ) |  | (3,223,740 | ) |  | (2,283,541 | )
Undiscounted future net cash flows | 2,816,556 |  |  | 9,489,013 |  |  | 8,263,550 |
10% annual discount | (1,501,994 | ) |  | (5,401,261 | ) |  | (4,245,939 | )
Standardized measure of discounted future net cash flows(2) | $ | 1,314,562 |  |  | $ | 4,087,752 |  |  | $ | 4,017,611 |
____________________
(1) | Includes abandonment costs.
(2) | Includes approximately $224.6 million, $643.3 million and $781.6 million attributable to noncontrolling interests at December 31, 2015, 2014 and 2013 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, 2012 | $ | 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 |
Changes during the year |
Revenues less production and other costs | (383,293 | )
Net changes in prices, production and other costs | (3,813,465 | )
Development costs incurred | 217,596 |
Net changes in future development costs | 273,437 |
Extensions and discoveries | 230,055 |
Revisions of previous quantity estimates | (1,354,778 | )
Accretion of discount | 512,483 |
Net change in income taxes | 1,426,333 |
Purchases of reserves in-place | 18,429 |
Sales of reserves in-place | — |
Timing differences and other(1) | 100,013 |
Net change for the year | (2,773,190 | )
Present value as of December 31, 2015(2) | $ | 1,314,562 |
____________________
(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 $224.6 million, $643.3 million and $781.6 million attributable to noncontrolling interests at December 31, 2015, 2014, and 2013 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, 2015, 2014 and 2013 as shown in the table below:
| December 31,
| 2015 |  | 2014 |  | 2013
Oil (MBbl) | 7,004 |  |  | 11,027 |  |  | 13,569 |
NGL (MBbl) | 3,694 |  |  | 4,761 |  |  | 4,737 |
Natural gas (MMcf) | 50,508 |  |  | 70,833 |  |  | 69,693 |

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