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Stock-based Compensation - (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of non-vested restricted common shares The following is summary of the status of the Trust’s non-vested restricted common shares during 2018, 2017, and 2016:
 
Common Shares
 
Weighted
Average Grant
Date Fair Value
Non-vested at December 31, 2015
311,839

 
$
14.17

Granted
155,306

 
17.96

Vested
(170,034
)
 
14.16

Forfeited
(326
)
 
15.36

Non-vested at December 31, 2016
296,785

 
16.16

Granted
143,593

 
19.74

Vested
(266,552
)
 
16.00

Forfeited
(550
)
 
18.78

Non-vested at December 31, 2017
173,276

 
19.36

Granted
206,446

 
14.87

Vested
(153,325
)
 
19.32

Forfeited
(1,258
)
 
16.27

Non-vested at December 31, 2018
225,139

 
$
15.29
Schedule of weighted average grant date fair value assumptions The Company utilized a Monte Carlo simulation to calculate the weighted average grant date fair values in 2018, 2017, and 2016 of $19.28, $33.43, and $28.50 per unit, respectively, using the following assumptions:
 
2018
 
2017
 
2016
Volatility
21.7
%
 
21.5
%
 
20.3
%
Dividend assumption
reinvested

 
reinvested

 
reinvested

Expected term in years
2.8 years

 
2.8 years

 
2.8 years

Risk-free rate
2.40
%
 
1.68
%
 
1.07
%
Stock price (per share)
$
14.78

 
$
19.80

 
$
17.67
Summary of the activity in the restricted share units The following is a summary of the activity in the Trust’s restricted share units during 2018, 2017, and 2016: 
 
Executive Awards
 
Trustee Awards
 
Restricted Share
Units
 
Weighted
Average Grant
Date Fair Value
 
Restricted Share
Units
 
Weighted
Average Grant
Date Fair Value
Non-vested at December 31, 2015
130,930

 
$
18.48

 
40,957

 
$
15.87

Granted
104,553

 
26.33

 
36,784

 
17.67

Vested
—

 
—

 
(20,481
)
 
15.87

Non-vested at December 31, 2016
235,483

 
21.84

 
57,260

 
17.03

Granted
174,320

 
29.34

 
32,831

 
19.80

Vested
(55,680
)
(1)
16.94

 
(38,871
)
 
16.72

Non-vested at December 31, 2017
354,123

 
26.30

 
51,220

 
19.04

Granted
254,282

 
16.58

 
50,745

 
14.78

Vested
(75,250
)
(2)
19.22

 
(34,807
)
 
18.67

Non-vested at December 31, 2018
533,155


$
22.66

 
67,158

 
$
16.01


(1)
Restricted units vested by Company executives in 2017 resulted in the issuance of 105,792 common shares, less 50,582 common shares withheld to cover minimum withholding tax obligations, for multiple employees.
(2)
Restricted units vested by Company executives in 2018 resulted in the issuance of 126,108 common shares, less 56,502 common shares withheld to cover minimum withholding tax obligations, for multiple employees.