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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2016
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 year ended December 31, 2016:

Number of Shares (in thousands)
Weighted Average Grant Date Fair Value
Unvested at December 31, 2015
285

$
16.33

Granted
153

29.77

Dividend reinvestment issuances
13

26.84

Vested
(115
)
27.66

Forfeited
(73
)
18.47

Unvested at December 31, 2016
263

$
19.13

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 year ended December 31, 2016:

Number of Shares (in thousands)
Weighted Average Reporting Date Fair Value
Unvested at December 31, 2015
100

$
20.72

Granted
106

30.30

Dividend reinvestment issuances
7

30.30

Vested
(82
)
27.18

Forfeited
(5
)
30.30

Unvested at December 31, 2016
126

$
30.30