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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Income Taxes [Line Items] |  |
Effective income tax rate | 67.90% | (64.00%)
Change in valuation allowance, discrete item | $ 12,700,000 |
Current tax expense | 5,691,000 | $ 3,435,000
Favorable (unfavorable) oil price adjustment | (3,100,000) | (500,000)
Current tax expense, net of favorable oil price adjustment | 2,600,000 | $ 2,900,000
Uncertain tax positions | $ 0 |

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