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Stock Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
A summary of our restricted stock awards from January 1, 2017 to September 30, 2017 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2017
567,540

 
$
10.62

Granted
324,502

 
11.19

Vested
(244,411
)
 
11.29

Forfeited
(16,669
)
 
10.80

Unvested balance at September 30, 2017
630,962

 
$
10.66
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2017 to September 30, 2017 is as follows:
 
Number of
Target Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2017
686,684

 
$
10.65

Granted
266,009

 
11.04

Additional units from dividends
24,703

 
11.21

Vested (1)
(200,374
)
 
12.15

Unvested balance at September 30, 2017
777,022

 
$
10.41


______________________
(1)
There was no payout of shares of our common stock for PSUs that vested on February 27, 2017, as our total stockholder return fell below the 30th percentile of the total stockholder returns of the peer group over the three-year performance period.