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Supplemental Gas Data (unaudited) - Costs Incurred for Property Acquisition, Exploration and Development (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property Acquisitions: |  |  |
Proved Properties | $ 16,622 | $ 36,710 | $ 38,621
Unproved Properties | 8,060 | 24,760 | 36,248
Development** | 432,438 | 1,063,945 | 986,419
Exploration | 33,644 | 79,855 | 61,604
Total | 490,764 | 1,205,270 | 1,122,892
Midstream |  |  |
Property Acquisitions: |  |  |
Development** | $ 67,000 | $ 325,000 | $ 142,000

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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas 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 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447 + Details
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