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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
A summary of our restricted stock awards from January 1, 2016 to June 30, 2016 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2016
474,567

 
$
12.72

Granted
451,739

 
8.91

Vested
(241,698
)
 
11.83

Unvested balance at June 30, 2016
684,608

 
$
10.52
Schedule of Nonvested Performance-based Units Activity
A summary of our PSUs from January 1, 2016 to June 30, 2016 is as follows:
 
Number of
Target Units
 
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2016
676,359

 
$
11.41

Granted
310,398

 
8.54

Additional units from dividends
19,296

 
9.27

Vested (1)
(242,096
)
 
9.85

Unvested balance at June 30, 2016
763,957

 
$
10.69