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Income Taxes (Classification of Net Deferred Tax Asset) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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)