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Equity Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Share Awards
A summary of the restricted shares granted to executive officers that have not fully vested pursuant to the Equity Incentive Plan as of December 31, 2017 are:
Award Type
Award Date
 
Total Shares Granted
 
Vested as of December 31, 2017
2014 Time-based Awards
1/31/2014
 
48,213

 
48,213

2014 Performance-based Awards
1/31/2014
 
38,805

 
12,935

2015 Time-based Awards
1/30/2015
 
40,161

 
26,774

2015 Performance-based Awards
1/30/2015
 
36,144

 

2015 Time-based Awards
6/1/2015
 
8,949

 
5,966

2017 Restricted Board Awards
1/11/2017
 
5,000

 

A summary of the Company’s restricted share awards for the years ended December 31, 2017, 2016 and 2015 is as follows:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
Number of
Shares
 
Weighted -
Average  Grant
Date Fair
Value
 
Number of
Shares
 
Weighted -
Average  Grant
Date Fair
Value
 
Number of
Shares
 
Weighted -
Average  Grant
Date Fair
Value
Non-vested at beginning of the period
110,825

 
$
22.05

 
170,480

 
$
21.38

 
179,641

 
$
14.92

Granted
5,000

 
20.20

 

 

 
85,254

 
26.59

Vested
(32,441
)
 
25.77

 
(59,655
)
 
20.14

 
(94,415
)
 
13.80

Forfeited
(25,870
)
 
13.17

 

 

 

 

Unvested at end of the period
57,514

 
$
23.78

 
110,825

 
$
22.05

 
170,480

 
$
21.38

Schedule of Share-based Payment Award, Valuation Assumptions
The grant date fair value of the performance LTIP awards were determined using a Monte Carlo simulation method with the following assumptions (based on the three year risk free U.S. Treasury yield over the measurement period of the LTIP awards):

 
Grant Date
Volatility
Dividend Yield
Risk Free Interest Rate
Discount
Outperformance Plan
6/1/2015
26%
4.5%
0.95%
—%
2016 Time-Based LTIP Unit Awards
1/28/16
28%
—%
0.79%
7.5%
2016 Performance-Based LTIP Unit Awards
1/28/16
30%
5.8%
1.13%
—%
2017 Time-Based LTIP Unit Awards
3/1/17
24%
—%
0.92%
7.5%
2017 Performance-Based LTIP Unit Awards
3/1/17
25%
5.8%
1.47%
—%
The grant date fair values of the performance-based share awards were determined using a Monte Carlo simulation method with the following assumptions:
Performance Award Grant Date
Volatility
Dividend Yield
Risk Free Interest Rate
1/31/2014
27
%
%
0.71
%
1/30/2015
29
%
%
0.84
%
Schedule of Share-based Compensation Arrangements by Share-based Payment Award
A summary of the Company's LTIP Unit awards for the years ended years ended December 31, 2017, 2016 and 2015 is as follows:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
Number of
Shares
 
Weighted -
Average  Grant
Date Fair
Value
 
Number of
Shares
 
Weighted -
Average  Grant
Date Fair
Value
 
Number of
Shares
 
Weighted -
Average  Grant
Date Fair
Value
Non-vested at beginning of the period
295,551

 
$
14.36

 
183,300

 
$
14.13

 
51,555

 
$
15.18

Granted
223,922

 
19.20

 
112,251

 
14.73

 
183,300

 
14.13

Vested
(37,417
)
 
14.73

 

 

 
(51,555
)
 
(15.18
)
Non-vested at end of period
482,056

 
$
16.58

 
295,551

 
$
14.36

 
183,300

 
$
14.13

Schedule of Share-based Payment Award, Performance-Based Long-Term Incentive Plan Payout Unit Awards
The 2017 Performance-Based LTIP Unit Awards, if earned, will be paid out between 50% and 150% of target value as follows:

 
Relative TSR Hurdles (Percentile)
 
Payout Percentage
Threshold
25th
 
50%
Target
50th
 
100%
Maximum
75th
 
150%