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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Taxes [Abstract] |  |  |  |
Income tax expense (benefit) on operations | $ 526 | $ 1,814 | $ 6,739 | $ (3,694)
Effective income tax rate | (5.40%) | 21.30% | 41.30% | 24.30%
Total operating income (loss) | $ (8,928) | $ 9,827 | $ 19,815 | $ (13,337)

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