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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits — January 1   $ 157 $ 157
Gross increases — tax positions in prior period
Gross decreases — tax positions in prior period   $ (157)  
Unrecognized tax benefits — December 31,     $ 157