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Stock Compensation Plans (Restricted Stock, RSUs and Performance Shares Activity Rollforward) (Details) - Restricted Stock, Performance Shares, and Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock, RSUs and Performance Shares Activity [Roll Forward]      
Outstanding, beginning of year 2,681 3,074 3,271
Granted 625 932 833
Vested (952) (1,181) (786)
Forfeited (169) (144) (244)
Outstanding, end of year 2,185 2,681 3,074
Vested, end of year 184 153 129
Outstanding, beginning of year, weighted-average per share grant date fair value $ 26 $ 23 $ 19
Granted, weighted-average per share grant date fair value 43 27 31
Vested, weighted-average per share grant date fair value 21 17 22
Forfeited, weighted-average per share grant date fair value 33 26 22
Outstanding, end of year, weighted-average per share grant date fair value 32 26 23
Vested, end of year, weighted-average per share grant date fair value $ 24 $ 20 $ 21