Revenue from Contracts with Customers - Current Long-Term Contracts Outstanding (Details) Boe in Thousands	Dec. 31, 2020 Boe MMcf
Q4 2021 | U.S.
Disaggregation of Revenue [Line Items]
Remaining performance obligation, oil quantity per day | Boe	17
Q4 2021 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	10
Q4 2022 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	7
Q4 2022 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	20
Q4 2023 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	25
Q4 2024 | Canada | Contracts to sell natural gas at Alberta AECO fixed prices
Disaggregation of Revenue [Line Items]
Remaining performance obligation	115
Q4 2024 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	32
Q4 2024 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	15
Q4 2026 | Canada | Contracts to sell natural gas at USD Index pricing
Disaggregation of Revenue [Line Items]
Remaining performance obligation	49