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Supplemental Oil and Gas Reserve Information - Unaudited (Tables) | 12 Months Ended
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Dec. 31, 2018
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |
Net Proved, Proved Developed and Proved Undeveloped Reserves | The following table sets forth the Company’s estimated net proved, proved developed and proved undeveloped reserves at December 31, 2018, 2017 and 2016:
| Oil (MBbl) |  | Gas (MMcf) |  | MBoe(1)
2016 |  |  |  |  |
Proved reserves |  |  |  |  |
Beginning balance | 184,928 |  |  | 199,828 |  |  | 218,233 |
Revisions of previous estimates | 11,713 |  |  | 116,539 |  |  | 31,136 |
Extensions, discoveries and other additions | 10,790 |  |  | 24,520 |  |  | 14,876 |
Sales of reserves in place | (5,828 | ) |  | (10,839 | ) |  | (7,635 | )
Purchases of reserves in place | 50,164 |  |  | 100,629 |  |  | 66,936 |
Production | (15,174 | ) |  | (19,573 | ) |  | (18,436 | )
Net proved reserves at December 31, 2016 | 236,593 |  |  | 411,104 |  |  | 305,110 |
Proved developed reserves, December 31, 2016 | 152,337 |  |  | 229,568 |  |  | 190,598 |
Proved undeveloped reserves, December 31, 2016 | 84,256 |  |  | 181,536 |  |  | 114,512 |
2017 |  |  |  |  |
Proved reserves |  |  |  |  |
Beginning balance | 236,593 |  |  | 411,104 |  |  | 305,110 |
Revisions of previous estimates | (28,323 | ) |  | 54,726 |  |  | (19,200 | )
Extensions, discoveries and other additions | 36,238 |  |  | 89,489 |  |  | 51,153 |
Sales of reserves in place | (1,196 | ) |  | (1,147 | ) |  | (1,387 | )
Purchases of reserves in place | 466 |  |  | 1,230 |  |  | 671 |
Production | (18,818 | ) |  | (31,946 | ) |  | (24,143 | )
Net proved reserves at December 31, 2017 | 224,960 |  |  | 523,456 |  |  | 312,204 |
Proved developed reserves, December 31, 2017 | 150,628 |  |  | 301,101 |  |  | 200,812 |
Proved undeveloped reserves, December 31, 2017 | 74,332 |  |  | 222,355 |  |  | 111,392 |
2018 |  |  |  |  |
Proved reserves |  |  |  |  |
Beginning balance | 224,960 |  |  | 523,456 |  |  | 312,204 |
Revisions of previous estimates | (17,352 | ) |  | 3,019 |  |  | (16,850 | )
Extensions, discoveries and other additions | 30,640 |  |  | 46,309 |  |  | 38,358 |
Sales of reserves in place | (12,470 | ) |  | (20,735 | ) |  | (15,926 | )
Purchases of reserves in place | 25,688 |  |  | 43,107 |  |  | 32,873 |
Production | (23,050 | ) |  | (42,430 | ) |  | (30,122 | )
Net proved reserves at December 31, 2018 | 228,416 |  |  | 552,726 |  |  | 320,537 |
Proved developed reserves, December 31, 2018 | 144,533 |  |  | 339,444 |  |  | 201,107 |
Proved undeveloped reserves, December 31, 2018 | 83,883 |  |  | 213,282 |  |  | 119,430 |
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(1) | N atural gas is converted to barrel equivalents at the rate of six thousand cubic feet of natural gas to one barrel of oil.
Standardized Measure of Discounted Future Cash Flows | The following table sets forth the Standardized Measure of discounted future net cash flows from projected production of the Company’s estimated net proved reserves at December 31, 2018, 2017 and 2016:
| At December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
Future cash inflows | $ | 16,652,405 |  |  | $ | 11,636,126 |  |  | $ | 9,426,963 |
Future production costs | (6,609,097 | ) |  | (4,458,418 | ) |  | (3,996,657 | )
Future development costs | (1,701,672 | ) |  | (992,271 | ) |  | (784,727 | )
Future income tax expense | (968,466 | ) |  | (580,481 | ) |  | (279,345 | )
Future net cash flows | 7,373,170 |  |  | 5,604,956 |  |  | 4,366,234 |
10% annual discount for estimated timing of cash flows | (3,322,864 | ) |  | (2,304,261 | ) |  | (1,883,169 | )
Standardized measure of discounted future net cash flows | $ | 4,050,306 |  |  | $ | 3,300,695 |  |  | $ | 2,483,065 |
Changes in Standardized Measure of Discounted Future Net Cash Flows Applicable to Proved Oil and Natural Gas Reserves | The following table sets forth the changes in the Standardized Measure of discounted future net cash flows applicable to estimated net proved reserves for the periods presented:
| 2018 |  | 2017 |  | 2016
| (In thousands)
January 1 | $ | 3,300,695 |  |  | $ | 2,483,065 |  |  | $ | 1,914,330 |
Net changes in prices and production costs | 1,003,008 |  |  | 881,742 |  |  | (367,527 | )
Net changes in future development costs | (89,304 | ) |  | (60,929 | ) |  | 69,992 |
Sales of oil and natural gas, net | (1,155,223 | ) |  | (769,367 | ) |  | (403,739 | )
Extensions | 461,196 |  |  | 661,467 |  |  | 165,926 |
Purchases of reserves in place | 385,763 |  |  | 6,518 |  |  | 533,505 |
Sales of reserves in place | (197,867 | ) |  | (9,024 | ) |  | (57,770 | )
Revisions of previous quantity estimates | (115,015 | ) |  | (78,942 | ) |  | 333,398 |
Previously estimated development costs incurred | 303,364 |  |  | 157,386 |  |  | 91,518 |
Accretion of discount | 368,374 |  |  | 262,776 |  |  | 202,272 |
Net change in income taxes | (240,908 | ) |  | (238,354 | ) |  | (36,303 | )
Changes in timing and other | 26,223 |  |  | 4,357 |  |  | 37,463 |
December 31 | $ | 4,050,306 |  |  | $ | 3,300,695 |  |  | $ | 2,483,065 |

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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/2009/role/commonPracticeRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61884-109447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61858-109447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61869-109447 + 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/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62476-109447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 36 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62536-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62424-109447 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 + Details
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