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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes equity classified restricted stock unit activity and unvested restricted stock units for the six months ended June 30, 2015:

Number of Shares
Weighted Average Grant Date Fair Value
Unvested at December 31, 2014
256,884

$
17.93

Granted
84,000

13.42

Dividend reinvestment issuances
13,455

14.28

Vested
(69,312
)
17.84

Forfeited
(11,167
)
17.20

Unvested at June 30, 2015
273,860

$
16.42

Restricted Stock Units, Liability Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes liability classified restricted stock unit activity and unvested restricted stock units for the six months ended June 30, 2015:

Number of Shares
Weighted Average Reporting Date Fair Value
Unvested at December 31, 2014
124,093

$
14.09

Granted
16,200

15.76

Dividend reinvestment issuances
5,535

15.76

Vested
(49,317
)
12.64

Forfeited


Unvested at June 30, 2015
96,511

$
15.76