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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share Based Compensation  
Summary of activity for vested and unvested stock options outstanding

Weighted-average

 

Number

Weighted-average

remaining

Aggregate

 

of shares

exercise price

contractual term

intrinsic value

 

    

under option

    

per share

    

(years)

    

(in millions)

 

Outstanding at January 1, 2020

4,864,425

$

14.48

7.34

$

Forfeited

(358,414)

18.53

Expired

(120,864)

81.32

Outstanding at December 31, 2020

4,385,147

$

12.31

6.62

$

Vested and exercisable at December 31, 2020

3,029,699

$

13.98

6.08

$

Service awards  
Share Based Compensation  
Summary of unvested deferred units activity

Number

Weighted-average

 

of

grant-date fair value

 

    

units

    

per unit

 

Unvested at January 1, 2020

4,719,578

$

9.11

 

Granted

7,093,421

1.41

Vested

(2,817,155)

8.63

Forfeited

(92,874)

7.25

Unvested at December 31, 2020

8,902,970

$

3.14

Performance awards  
Share Based Compensation  
Summary of unvested deferred units activity

Number

Weighted-average

 

of

grant-date fair value

 

    

units

    

per unit

 

Unvested at January 1, 2020

2,081,619

$

10.78

Granted

2,530,460

1.80

Vested

(999,332)

10.79

Forfeited

(51,863)

10.78

Unvested at December 31, 2020

3,560,884

$

4.40