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Employee Incentive, Deferred Compensation, And Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share Based Compensation Allocation And Classification In Financial Statements [Abstract]  
Unvested Stock Award Activity

 

 

 

Units/Awards

 

 

Weighted-average grant date fair value

 

Unvested December 31, 2016

 

 

16,276

 

 

$

39.40

 

Granted

 

 

1,422

 

 

 

51.24

 

Vested

 

 

(1,875

)

 

 

33.59

 

Converted to restricted stock

 

 

(3,111

)

 

 

39.49

 

Cancelled

 

 

(433

)

 

 

33.93

 

Unvested December 31, 2017

 

 

12,279

 

 

$

42.17