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Income Taxes (Classification of Net Deferred Tax Asset) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Taxes [Abstract] |  |
Long-term deferred tax assets | $ 26,907 | $ 4,663
Long-term deferred tax liabilities | (12,935) | (12,530)
Net deferred tax assets (liabilities) | $ 13,972 |
Net deferred tax liabilities |  | $ (7,867)

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