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