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Financial Instruments and Risk Management - Narrative (Details) barrels_per_day in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 barrels_per_day $ / bbl | Dec. 31, 2020 USD ($) barrels_per_day derivative $ / bbl | Dec. 31, 2019 USD ($) barrels_per_day derivative $ / bbl | Dec. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of loss reclassified to interest expense |  | $ (1.5) | $ (6.3) |
Amount of loss expected to be reclassified to interest expense in the next 12 months |  | (1.5) |  | $ (3.0)
Income taxes on deferred loss on fair value of interest rate derivative contracts |  | $ 1.7 |  |
Notes due 2022 |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt instrument term |  | 10 years |  |
Commodity derivative contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Daily production commitment (barrels per day) | barrels_per_day |  | 45 | 45 |
Derivative swap, average price (in USD per barrel) | $ / bbl |  | 42.77 | 56.42 |
Commodity derivative contracts | Forecast |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative swap, average price (in USD per barrel) | $ / bbl | 44.27 |  |  |
Commodity derivative contracts | Forecast | Subsequent Event |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Daily production commitment (barrels per day) | barrels_per_day | 15 |  |  |
Interest rate swap |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts |  | $ 0.4 |  |
Foreign exchange contract |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of derivative instruments held (in derivatives) | derivative |  | 0 | 0 |

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