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OIL AND NATURAL GAS PROPERTIES (Tables) | 12 Months Ended
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Dec. 31, 2018
OIL AND NATURAL GAS PROPERTIES |
Schedule of oil and natural gas properties | Oil and natural gas properties as of December 31, 2018 and 2017 consisted of the following (in thousands):
|  | December 31, 2018 |  | December 31, 2017
Subject to depletion |  | $ | 1,470,509 |  | $ | 877,316
Not subject to depletion: |  |  |  |  |  |
Exploration and extension wells in progress |  |  | 23,536 |  |  | 5,298
Other capital costs: |  |  |  |  |  |
Incurred in 2018 |  |  | 310,113 |  |  | —
Incurred in 2017 |  |  | 638,269 |  |  | 760,488
Incurred in 2016 |  |  | — |  |  | —
Incurred in 2015 and prior |  |  | — |  |  | —
Total not subject to depletion |  |  | 971,918 |  |  | 765,786
Gross oil and natural gas properties |  |  | 2,442,427 |  |  | 1,643,102
Less accumulated depletion |  |  | (639,951) |  |  | (570,155)
Net oil and natural gas properties |  | $ | 1,802,476 |  | $ | 1,072,947
Schedule of the Company's Oil and Natural Gas prices used in the calculation of the ceiling test value of the Company's reserves |
|  | West Texas |  |
|  | Intermediate |  | Henry Hub
|  | (per barrel) (1) |  | (per MMBtu) (1)
December 31, 2018 |  | $ | 65.56 |  | $ | 3.100
December 31, 2017 |  |  | 51.34 |  |  | 2.976
December 31, 2016 |  |  | 42.75 |  |  | 2.481
(1) Unweighted average of the first day of the 12‑months ended spot price, adjusted by lease or field for quality, transportation fees and market differentials.

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- Definition Tabular disclosure of the entity's Oil and Natural Gas prices used in the calculation of the ceiling test value of the Company's reserves. + References No definition available. + Details
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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=68064819&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=68064819&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=68064819&loc=d3e61926-109447 + Details
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