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Equity - Shares Withheld for Taxes (Details) - Treasury Stock - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares withheld for taxes 51 56
Value of shares withheld for taxes $ 64 $ 367