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Income Taxes (Reasons For The Difference Between Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Income tax expense at statutory rate $ 2,402 $ 9,868 $ 24,466
Effect of state taxes, net of federal tax benefit 1,150 1,992 3,837
Effect of federal rate change, net of federal tax benefit     (1,005)
Effect of state rate changes on net deferred liabilities (1,940) (755) 833
Change in valuation allowance 698 255 (283)
Non-deductible items 1,322 1,258 1,182
Tax credits (420) (478) (489)
Income Tax Expense (Benefit), Total $ 3,212 $ 12,140 $ 28,541