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v3.20.2

Impairment (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) $ / bbl | Jun. 30, 2020 USD ($) $ / bbl | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / bbl | Sep. 30, 2019 USD ($) | Sep. 30, 2020 $ / Mcf | Jun. 30, 2020 $ / Mcf
Assets and Liabilities Held for Sale [Line Items] |  |  |  |  |  |  |
Impairment | $ 44,043,000 |  | $ 165,507,000 | $ 253,797,000 | $ 165,507,000 |  |
Full cost ceiling limitation impairment | $ 44,000,000.0 |  | 0 | $ 215,800,000 | 0 |  |
Commodity price (usd per unit) | 43.40 | 47.17 |  | 43.40 |  | 1.97 | 2.07
Disposal Group, Held-for-sale, Not Discontinued Operations | Corporate Headquarters Building |  |  |  |  |  |  |
Assets and Liabilities Held for Sale [Line Items] |  |  |  |  |  |  |
Impairment of Real Estate |  | $ 38,000,000.0 | $ 0 | $ 38,000,000.0 | $ 0 |  |

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