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Deferred Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Units Activity
The activity related to the restricted stock units is set forth below:

 
Restricted Stock Units Outstanding
 
2017
 
2016
 
Units
 
Grant Date
Weighted
Average Fair
Value
 
Units
 
Grant Date
Weighted
Average Fair
Value
Outstanding, January 1,
4,844,956

 
$
33.38

 
3,723,129

 
$
45.88

Granted
2,227,659

(1) 
20.87

 
2,407,173

(2) 
21.61

Delivered
(1,219,193
)
(1) 
37.38

 
(871,226
)
(2) 
52.27

Forfeited
(456,694
)
 
24.76

 
(414,120
)
 
37.66

Outstanding, December 31,
5,396,728

 
$
28.02

 
4,844,956

 
$
33.38


_____________________________________________
(1)
Excludes 1,811,132 stock units granted and 931,180 stock units delivered to employees in connection with the annual awards granted and vested subsequent to December 31, 2017 as part of the long-term incentive awards program.
(2)
Excludes 973,946 stock units granted and 1,023,132 stock units delivered to employees in connection with the annual awards granted and vested subsequent to December 31, 2016 as part of the long-term incentive awards program.