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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Information about Restricted Stock Grants Outstanding
The following table summarizes information about outstanding restricted stock grants as of September 30, 2019: 
Grant
 
Shares
('000)
 
Vesting Schedule
 
Unearned
Compensation
 
Remaining
Periods
(in months)
October 2016
 
411

 
3 equal annual installments commencing on October 20, 2017
 
$
51.2

 
1
July 2017
 
6

 
3 equal annual installments commencing on October 20, 2017
 
$
1.3

 
1
October 2017
 
303

 
3 equal annual installments commencing on October 20, 2018
 
$
953.4

 
13
October 2018
 
382

 
3 equal annual installments commencing on October 20, 2019
 
$
1,733.3

 
25
May 2019
 
71

 
Shares granted to independent board members that fully vest as of May 16, 2020
 
$
315.0

 
7
Summary of Information about Nonvested Restricted Stock Grants
The following table summarizes information about the non-vested restricted stock grants for the nine months ended September 30, 2019 and 2018: 
 
Nine months ended September 30,
 
2019
 
2018
 
Shares
('000s)
 
Weighted-
Average
Grant-Date
Fair Value
 
Shares
('000s)
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at December 31
760

 
$
7.56

 
787

 
$
6.84

Granted
75

 
7.60

 
64

 
8.41

Vested
(68
)
 
8.38

 

 

Forfeited
(21
)
 
7.48

 
(16
)
 
7.12

Nonvested at September 30
746

 
$
7.49

 
835

 
$
6.96