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Stock Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
A summary of our restricted stock awards from January 1, 2018 to September 30, 2018 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2018
630,962

 
$
10.66

Granted
349,091

 
10.19

Vested
(287,148
)
 
11.02

Forfeited
(51,061
)
 
10.44

Unvested balance at September 30, 2018
641,844

 
$
10.25
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2018 to September 30, 2018 is as follows:
 
Number of
Target Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2018
785,797

 
$
10.42

Granted
293,111

 
9.82

Additional units from dividends
26,068

 
11.13

Vested (1)
(218,514
)
 
11.98

Forfeited
(113,668
)
 
9.86

Unvested balance at September 30, 2018
772,794

 
$
11.18


______________________
(1)
The number of shares of common stock earned for the PSUs vested in 2018 was equal to 51.75% of the PSU Target Award.