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Financial Instruments and Risk Management (Narrative) (Details) barrels_per_day in Thousands, $ in Millions | 9 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) barrels_per_day contract OffsettingPosition $ / bbl | Dec. 31, 2021 barrels_per_day $ / bbl | Dec. 31, 2019 Acquisition | Dec. 31, 2020 OffsettingPosition | Sep. 30, 2020 contract
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Amount of loss reclassified to interest expense | $ | $ (2.1) |  |  |  |
Number of foreign currency derivatives (in contracts) | contract | 0 |  |  |  | 0
Number of businesses acquired (in acquisitions) | Acquisition |  |  | 2 |  |
Number of offsetting positions (in offsetting positions) | OffsettingPosition | 0 |  |  | 0 |
Commodity derivative contracts |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Daily production commitment (barrels per day) | barrels_per_day | 45 |  |  |  |
Average forward price (in dollars per barrel) | $ / bbl | 42.77 |  |  |  |
Forecast | Commodity derivative contracts |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Daily production commitment (barrels per day) | barrels_per_day |  | 20 |  |  |
Average forward price (in dollars per barrel) | $ / bbl |  | 44.88 |  |  |

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