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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of restricted stock awards A summary of our restricted stock awards from January 1, 2019 to June 30, 2019 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2019
641,844

 
$
10.25

Granted
73,240

 
10.65

Vested
(300,575
)
 
10.07

Forfeited
(2,830
)
 
10.60

Unvested balance at June 30, 2019
411,679

 
$
10.46
Schedule of nonvested performance-based units activity
A summary of our PSUs from January 1, 2019 to June 30, 2019 is as follows:
 
Number of
Target Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2019
781,923

 
$
11.19

Granted
296,050

 
10.14

Additional units from dividends
20,369

 
9.94

Vested (1)
(251,375
)
 
8.80

Unvested balance at June 30, 2019
846,967

 
$
10.29


______________________
(1)
The number of shares of common stock earned for the PSUs vested in 2019 was equal to 74.33% of the PSU Target Award.