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v3.20.2

Impairment (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) $ / bbl | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / bbl | Jun. 30, 2019 USD ($) | Jun. 30, 2020 $ / Mcf
Assets and Liabilities Held for Sale [Line Items] |  |  |  |  |
Impairment | $ 201,784,000 | $ 0 | $ 209,754,000 | $ 0 |
Full cost ceiling limitation impairment |  | 163,800,000 | $ 171,800,000 |  |
Commodity price (usd per unit) | 47.17 |  | 47.17 |  | 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 | $ 0 | $ 38,000,000.0 | $ 0 | $ 38,000,000.0 |

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