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Stock Incentive Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2018
630,962

 
$
10.66

Granted
322,444

 
10.18

Vested
(287,148
)
 
11.02

Unvested balance at March 31, 2018
666,258

 
$
10.27
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2018 to March 31, 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
264,509

 
9.84

Additional units from dividends
8,462

 
11.61

Vested (1)
(218,514
)
 
11.98

Unvested balance at March 31, 2018
840,254

 
$
9.84


______________________
(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.