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Exploration and Production Activities (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |
Capitalized costs relating to oil and gas producing activities disclosure | The following table sets forth capitalized costs and accumulated depreciation, depletion and amortization related to oil and natural gas producing activities at December 31:
| 2015 |  | * | 2014 |  | 2013 |
| (In thousands)
Subject to amortization | $ | — |  |  | $ | 3,205,036 |  | $ | 2,893,010 |
Not subject to amortization | — |  |  | 132,141 |  | 124,869 |
Total capitalized costs | — |  |  | 3,337,177 |  | 3,017,879 |
Less accumulated depreciation, depletion and amortization | — |  |  | 1,752,566 |  | 1,562,116 |
Net capitalized costs | $ | — |  |  | $ | 1,584,611 |  | $ | 1,455,763 |
* Excludes assets held for sale.
Cost incurred in oil and gas property acquisition, exploration, and development activities disclosure | Capital expenditures, including those not subject to amortization, related to oil and natural gas producing activities were as follows:
Years ended December 31, | 2015 |  | * | 2014 |  | ** | 2013 |  | **
| (In thousands) |
Acquisitions: |  |  |  |  |  |  |  |  |
Proved properties | $ | — |  |  | $ | 87,919 |  |  | $ | 1,817 |  |
Unproved properties | — |  |  | 138,683 |  |  | 4,608 |  |
Exploration | — |  |  | 16,879 |  |  | 26,975 |  |
Development | — |  |  | 331,400 |  |  | 355,421 |  |
Total capital expenditures | $ | — |  |  | $ | 574,881 |  |  | $ | 388,821 |  |
* No wells were drilled in 2015. ** Excludes net additions/(reductions) to property, plant and equipment related to the recognition of future liabilities for asset retirement obligations associated with the plugging and abandonment of oil and natural gas wells of $(9.0) million and $(10.7) million for the years ended December 31, 2014 and 2013, respectively.
Results of operations for oil and gas producing activities disclosure | The following reflects the results of operations from the Company's oil and natural gas producing activities included in discontinued operations, excluding corporate overhead and financing costs:
Years ended December 31, | 2015 |  | 2014 |  | 2013 |
|  | (In thousands) |  |
Income (loss) from discontinued operations | $ | (772,385 | ) | $ | 111,998 |  | $ | 110,191 |
Schedule of proved developed and undeveloped oil and gas reserve quantities | The changes in the Company's estimated quantities of proved oil, NGL and natural gas reserves for the year ended December 31, 2015, were as follows:
| Oil (MBbls) |  | NGL (MBbls) |  | Natural Gas (MMcf) |  | Total (MBOE) |
Proved developed and undeveloped reserves: |  |  |  |
Balance at beginning of year | 43,918 |  | 7,187 |  | 245,011 |  | 91,940 |
Production | (3,286 | ) | (393 | ) | (16,747 | ) | (6,471 | )
Extensions and discoveries | 744 |  | 29 |  | 681 |  | 888 |
Improved recovery | — |  | — |  | — |  | — |
Purchases of proved reserves | — |  | — |  | — |  | — |
Sales of proved reserves | (16,474 | ) | (6,864 | ) | (202,560 | ) | (57,097 | )
Revisions of previous estimates | (12,215 | ) | 252 |  | (23,854 | ) | (15,939 | )
Balance at end of year | 12,687 |  | 211 |  | 2,531 |  | 13,321 |
Significant changes in proved reserves for the year ended December 31, 2015, include:
• | Sales of proved reserves of (57.1) MMBOE, primarily due to the Company's decision to sell Fidelity and exit the exploration and production business
• | Revisions of previous estimates of (15.9) MMBOE, largely the result of lower commodity prices
The changes in the Company's estimated quantities of proved oil, NGL and natural gas reserves for the year ended December 31, 2014, were as follows:
| Oil (MBbls) |  | NGL (MBbls) |  | Natural Gas (MMcf) |  | Total (MBOE) |
Proved developed and undeveloped reserves: |  |  |  |
Balance at beginning of year | 41,019 |  | 6,602 |  | 198,445 |  | 80,695 |
Production | (4,919 | ) | (609 | ) | (20,822 | ) | (8,998 | )
Extensions and discoveries | 9,654 |  | 3,634 |  | 64,420 |  | 24,025 |
Improved recovery | — |  | — |  | — |  | — |
Purchases of proved reserves | 5,463 |  | — |  | 7,711 |  | 6,748 |
Sales of proved reserves | (4,945 | ) | (3,109 | ) | (40,451 | ) | (14,796 | )
Revisions of previous estimates | (2,354 | ) | 669 |  | 35,708 |  | 4,266 |
Balance at end of year | 43,918 |  | 7,187 |  | 245,011 |  | 91,940 |
Significant changes in proved reserves for the year ended December 31, 2014, include:
• | Extensions and discoveries of 24.0 MMBOE, primarily due to drilling activity at the Company's East Texas, Bakken and Powder River Basin properties
• | Purchases of proved reserves of 6.7 MMBOE, primarily due to the purchase of working interests and leasehold positions in the Powder River Basin
• | Sales of proved reserves of (14.8) MMBOE, primarily at the Company's South Texas and Bakken properties
• | Revisions of previous estimates of 4.3 MMBOE, largely the result of higher natural gas prices and well performance revisions
The changes in the Company's estimated quantities of proved oil, NGL and natural gas reserves for the year ended December 31, 2013, were as follows:
| Oil (MBbls) |  | NGL (MBbls) |  | Natural Gas (MMcf) |  | Total (MBOE) |
Proved developed and undeveloped reserves: |  |  |  |
Balance at beginning of year | 33,453 |  | 7,153 |  | 239,278 |  | 80,486 |
Production | (4,815 | ) | (781 | ) | (28,008 | ) | (10,264 | )
Extensions and discoveries | 13,313 |  | 1,333 |  | 26,428 |  | 19,050 |
Improved recovery | — |  | — |  | — |  | — |
Purchases of proved reserves | — |  | — |  | — |  | — |
Sales of proved reserves | (1,286 | ) | (25 | ) | (40,055 | ) | (7,987 | )
Revisions of previous estimates | 354 |  | (1,078 | ) | 802 |  | (590 | )
Balance at end of year | 41,019 |  | 6,602 |  | 198,445 |  | 80,695 |
Significant changes in proved reserves for the year ended December 31, 2013, include:
• | Extensions and discoveries of 19.1 MMBOE, primarily due to drilling activity and new PUD locations at the Company's Bakken and Paradox Basin properties, as well as new PUD locations at Big Horn and East Texas
• | Sales of proved reserves of (8.0) MMBOE, primarily at the Company's Green River Basin property
The following table summarizes the breakdown of the Company's proved reserves between proved developed and PUD reserves at December 31:
| 2015 |  | 2014 |  | 2013 |
Proved developed reserves: |  |  |
Oil (MBbls) | 11,380 |  | 30,130 |  | 31,394 |
NGL (MBbls) | 144 |  | 4,217 |  | 5,322 |
Natural Gas (MMcf) | 2,033 |  | 184,437 |  | 176,546 |
Total (MBOE) | 11,865 |  | 65,086 |  | 66,140 |
PUD reserves: |  |  |
Oil (MBbls) | 1,307 |  | 13,788 |  | 9,625 |
NGL (MBbls) | 67 |  | 2,970 |  | 1,280 |
Natural Gas (MMcf) | 498 |  | 60,574 |  | 21,899 |
Total (MBOE) | 1,456 |  | 26,854 |  | 14,555 |
Total proved reserves: |  |  |
Oil (MBbls) | 12,687 |  | 43,918 |  | 41,019 |
NGL (MBbls) | 211 |  | 7,187 |  | 6,602 |
Natural Gas (MMcf) | 2,531 |  | 245,011 |  | 198,445 |
Total (MBOE) | 13,321 |  | 91,940 |  | 80,695 |
Standardized measure of discounted future cash flows relating to proved reserves disclosure | The standardized measure of the Company's estimated discounted future net cash flows of total proved reserves associated with its various oil and natural gas interests at December 31 was as follows:
| 2014 |  | 2013 |
| (In thousands)
Future cash inflows | $ | 5,185,500 |  | $ | 4,507,000 |
Future production costs | 1,856,900 |  | 1,734,800 |
Future development costs | 570,200 |  | 403,000 |
Future net cash flows before income taxes | 2,758,400 |  | 2,369,200 |
Future income tax expense | 686,100 |  | 545,200 |
Future net cash flows | 2,072,300 |  | 1,824,000 |
10% annual discount for estimated timing of cash flows | 997,400 |  | 810,000 |
Discounted future net cash flows relating to proved oil, NGL and natural gas reserves | $ | 1,074,900 |  | $ | 1,014,000 |
Note: | Standardized measure not applicable in 2015 as the remaining oil and natural gas properties are held for sale and subject to fair value impairment.
The following are the sources of change in the standardized measure of discounted future net cash flows by year:
| 2014 |  | 2013 |
| (In thousands)
Beginning of year | $ | 1,014,000 |  | $ | 883,400 |
Net revenues from production | (368,900 | ) | (398,000 | )
Net change in sales prices and production costs related to future production | 86,300 |  | 162,200 |
Extensions and discoveries, net of future production-related costs | 231,900 |  | 366,500 |
Improved recovery, net of future production-related costs | — |  | — |
Purchases of proved reserves, net of future production-related costs | 103,800 |  | — |
Sales of proved reserves | (219,300 | ) | (37,800 | )
Changes in estimated future development costs | 65,100 |  | 6,700 |
Development costs incurred during the current year | 104,600 |  | 141,500 |
Accretion of discount | 109,400 |  | 94,600 |
Net change in income taxes | (33,400 | ) | (141,400 | )
Revisions of previous estimates | (16,300 | ) | (55,800 | )
Other | (2,300 | ) | (7,900 | )
Net change | 60,900 |  | 130,600 |
End of year | $ | 1,074,900 |  | $ | 1,014,000 |
Note: | Standardized measure not applicable in 2015 as the remaining oil and natural gas properties are held for sale and subject to fair value impairment.

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- Definition Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63019-109448 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61929-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61926-109447 + Details
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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 55 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63042-109448 Reference 2: 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=51678428&loc=d3e62059-109447 Reference 3: 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=51678428&loc=d3e62038-109447 Reference 4: 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=51678428&loc=d3e62014-109447 Reference 5: 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 + 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 30 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62424-109447 Reference 2: 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=51678428&loc=d3e62476-109447 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=51678428&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 35 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 Reference 5: 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=51678428&loc=d3e62455-109447 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=51678428&loc=d3e62479-109447 + Details
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