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Financial Instruments and Risk Management (Narrative) (Details) barrels_per_day in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 barrels_per_day $ / bbl | Dec. 31, 2019 barrels_per_day OffsettingPosition | Sep. 30, 2020 USD ($) barrels_per_day OffsettingPosition contract $ / bbl | Sep. 30, 2019 USD ($) barrels_per_day contract $ / bbl | Dec. 31, 2019 Acquisition OffsettingPosition | Dec. 31, 2021 $ / bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Number of foreign currency derivatives (in contracts) | contract |  |  | 0 | 0 |  |
Amount of loss reclassified to interest expense |  |  | $ 1.1 | $ 2.2 |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts |  |  | 2.0 |  |  |
Derivative loss |  |  | $ 0.4 |  |  |
Number of businesses acquired (in acquisitions) | Acquisition |  |  |  |  | 2 |
Number of offsetting positions (in offsetting positions) | OffsettingPosition |  | 0 | 0 |  | 0 |
Commodity derivative contracts |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Daily production commitment (barrels per day) | barrels_per_day |  | 35 | 45 | 35 |  |
Average forward price (in dollars per barrel) | $ / bbl |  |  | 56.42 | 60.51 |  |
Interest Rate Swap |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts |  |  | $ 0.5 |  |  |
Notes Due 2022 |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Debt instrument term |  |  | 10 years |  |  |
Forecast | Commodity derivative contracts |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Average forward price (in dollars per barrel) | $ / bbl | 57.59 |  |  |  |  | 43.31
Forecast | Commodity derivative contracts | Subsequent Event |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Daily production commitment (barrels per day) | barrels_per_day | 18 |  |  |  |  |

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