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Employee Incentive, Deferred Compensation, And Retirement Plans (Schedule Of Unvested Restricted Stock Award Roll Forward) (Details) - Restricted Stock Units and Restricted Stock Awards [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, Beginning balance | shares 16,276
Granted | shares 1,422
Vested | shares (1,875)
Converted to restricted stock | shares (3,111)
Cancelled | shares (433)
Unvested, Ending balance | shares 12,279
Unvested, Weighted-average grant date fair value, Beginning balance | $ / shares $ 39.40
Granted, Weighted-average grant date fair value | $ / shares 51.24
Vested | $ / shares 33.59
Converted to restricted stock | $ / shares 39.49
Cancelled, Weighted-average grant date fair value | $ / shares 33.93
Unvested, Weighted-average grant date fair value, Ending balance | $ / shares $ 42.17