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Share-Based Compensation (RSUs Vested and Converted) (Details) - RSUs - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs vested during the year 996 1,428 1,337
RSUs converted during the year, net of shares withheld for taxes 666 950 865
Shares withheld for taxes 329 478 472