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Financial Instruments and Risk Management (Carrying Value of Assets and Liabilities Recorded at Fair Value on Recurring Basis) (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 30, 2019 barrels_per_day $ / bbl | Sep. 30, 2020 bbl / d | Sep. 30, 2019 USD ($) bbl / d $ / bbl | Sep. 30, 2018 barrels_per_day $ / bbl | Jun. 30, 2020 $ / bbl | Dec. 31, 2018 USD ($)
Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | $ 104,358 |  |  | $ 3,837
Liabilities |  |  | 153,187 |  |  | 61,575
Fair Value, Measurements, Recurring | Commodity derivative contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 104,358 |  |  | 3,837
Fair Value, Measurements, Recurring | Nonqualified employee savings plans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 15,499 |  |  | 13,845
Fair Value, Measurements, Recurring | Contingent consideration |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 137,688 |  |  | 47,730
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 0 |  |  | 0
Liabilities |  |  | 15,499 |  |  | 13,845
Fair Value, Measurements, Recurring | Level 1 | Commodity derivative contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 1 | Nonqualified employee savings plans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 15,499 |  |  | 13,845
Fair Value, Measurements, Recurring | Level 1 | Contingent consideration |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 104,358 |  |  | 3,837
Liabilities |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 2 | Commodity derivative contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 104,358 |  |  | 3,837
Fair Value, Measurements, Recurring | Level 2 | Nonqualified employee savings plans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 2 | Contingent consideration |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 0 |  |  | 0
Liabilities |  |  | 137,688 |  |  | 47,730
Fair Value, Measurements, Recurring | Level 3 | Commodity derivative contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 3 | Nonqualified employee savings plans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | 0 |  |  | 0
Fair Value, Measurements, Recurring | Level 3 | Contingent consideration |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities |  |  | $ 137,688 |  |  | $ 47,730
Commodity derivative contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Average Forward Price (in dollars per barrel) | $ / bbl |  |  | 60.51 | 54.88 |  |
Oil and Gas Delivery Commitments and Contracts, Daily Production |  |  | 35,000 | 21,000 |  |
Subsequent Event | Commodity derivative contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Average Forward Price (in dollars per barrel) | $ / bbl | 56.42 |  |  |  | 57.59 |
Oil and Gas Delivery Commitments and Contracts, Daily Production | 45,000 | 35,000 |  |  |  |

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