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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Equity Classified Restricted Stock Unit Activity and Unvested Restricted Stock Units
The following table summarizes equity classified restricted stock unit activity and unvested restricted stock units for the year ended December 31, 2018:

Number of Shares (in thousands)
Weighted Average Grant Date Fair Value
Unvested at December 31, 2017
640

$
11.56

Granted
567

9.34

Dividend reinvestment issuances
53

9.11

Vested
(324
)
10.61

Forfeited
(109
)
12.75

Unvested at December 31, 2018
827

$
10.09

The following table summarizes liability classified restricted stock unit activity and unvested restricted stock units for the year ended December 31, 2018:

Number of Shares (in thousands)
Weighted Average Reporting Date Fair Value
Unvested at December 31, 2017
224

$
12.40

Granted
28

7.43

Dividend reinvestment issuances
8

7.43

Vested
(70
)
10.19

Forfeited
(122
)
11.17

Unvested at December 31, 2018
68

$
7.43