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Costs Incurred for Property Acquisition, Exploration and Development (Tables) | 6 Months Ended
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Jun. 30, 2021
Extractive Industries [Abstract] |
Costs Incurred for Property Acquisition, Exploration and Development |
|  | Six Months Ended June 30, 2021 |  |  | Year Ended December 31, 2020 |
|  | (in thousands) |
Acquisitions: |  |  |  |  |  |
Acreage purchases |  | $ | 10,142 |  |  | $ | 26,166 |
Development |  |  | 207,354 |  |  |  | 369,093 |
Exploration: |  |  |  |  |  |
Drilling |  |  | 5,432 |  |  |  | 7,709 |
Expense |  |  | 9,818 |  |  |  | 31,376 |
Stock-based compensation expense |  |  | 748 |  |  |  | 1,279 |
Gas gathering facilities: |  |  |  |  |  |
Development |  |  | 2,179 |  |  |  | 3,694 |
Subtotal |  |  | 235,673 |  |  |  | 439,317 |
Asset retirement obligations |  |  | 2,098 |  |  |  | 2,610 |
Total costs incurred |  | $ | 237,771 |  |  | $ | 441,927 |
(a) Includes costs incurred whether capitalized or expensed.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447 + Details
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