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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Activity and Value of Nonvested Restricted Stock and Performance Share Awards
The following table summarizes the activity and value of nonvested restricted stock and performance share awards for the years ended December 31, 2019 and 2018:
 
2019
 
2018
 
Number  of
Shares
 
Weighted
Average
Grant-date
Value
Per Share
 
Number  of
Shares
 
Weighted
Average
Grant-date
Value
Per Share
Nonvested awards at beginning of year
2,585

 
$
19.94

 
1,760

 
$
31.88

Granted
3,624

 
5.29

 
2,249

 
15.34

Vested
(729
)
 
18.90

 
(615
)
 
31.60

Forfeited
(965
)
 
11.86

 
(809
)
 
22.59

Nonvested awards at end of year
4,515

 
9.69

 
2,585

 
19.94