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Income Taxes Interest and Penalty Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Interest expense (benefit) $ 193 $ 98 $ 144
Penalty expense (benefit) $ (115) $ (158) $ (64)