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Share-Based Compensation, Employee Incentive and Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest [Table Text Block] A summary of restricted stock and performance stock unit activity is presented below (shares in thousands):
 
Restricted Stock Units
 
Performance Share Units
 
Units
 
Weighted Average Grant Date Fair Value
 
Units
 
Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017
2,444

 
$
29.02

 
181

 
$
43.64

Granted(1)
903

 
50.14

 
169

 
44.21

Vested(1)
(1,293
)
 
28.07

 
(121
)
 
34.97

Forfeited
(67
)
 
39.25

 
—

 
—

Outstanding at December 31, 2018
1,987

 
$
39.87

 
229

 
$
48.66

 
 
 
 
 
 
 
 
Expected to vest at December 31, 2018
1,902

 
$
38.48

 
 
 
 

(1)
The number of performance share units granted and vested includes the impact of the achievement of performance targets.