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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options Activity
A summary of option activity under the Plan as of December 31, 2018, and changes during the year then ended, is presented below: 
($ in thousands, except share and per share data)
 
Aggregate Intrinsic Value
 
Weighted-Average Remaining
Contractual Term (in years)
 
Options
 
Weighted-Average
Exercise Price
Outstanding at January 1, 2018
 
 
 
 
 
181,212

 
$
37.77

Granted
 
 
 
 
 
—

 
—

Exercised
 
 
 
 
 
(3,125
)
 
10.56

Expired
 
 
 
 
 
(117,520
)
 
49.16

Forfeited
 
 
 
 
 
—

 
—

Outstanding at December 31, 2018
 
$
20,739

 
1.21
 
60,567

 
$
17.08

Exercisable at December 31, 2018
 
$
20,739

 
1.21
 
60,567

 
$
17.08

Exercisable at December 31, 2017
 
 
 
 
 
181,212

 
$
37.77
Schedule of Restricted Stock Activity
The following table summarizes the time-based restricted unit grants and vestings during the years ended December 31, 2018, 2017, and 2016:  

($ in thousands, except unit and per unit data)
 
Number of Restricted Units Granted
 
Weighted Average
Grant Date Fair
Value per Unit
 
Fair Value of Restricted Units Vested
2018
 
92,019

 
$
13.16

 
$
1,924

2017
 
44,490

 
23.22

 
1,516

2016
 
46,562

 
26.48

 
1,929

The following table summarizes the restricted share grants and vestings during the years ended December 31, 2018, 2017, and 2016:  

($ in thousands, except share and per share data)
 
Number of Restricted Shares Granted
 
Weighted Average
Grant Date Fair
Value per share
 
Fair Value of Restricted Shares Vested
2018
 
202,043

 
$
15.35

 
$
2,038

2017
 
85,150

 
22.15

 
2,529

2016
 
81,603

 
26.87

 
3,313

The following table summarizes the activity for time-based restricted unit awards for the year ended December 31, 2018:  
 
 
Number of Restricted
Units
 
Weighted Average
Grant Date Fair
Value per unit
Restricted units outstanding at January 1, 2018
 
150,448

 
$
23.13

Restricted units granted
 
92,019

 
13.16

Restricted units vested
 
(117,805
)
 
21.19

Restricted units outstanding at December 31, 2017
 
124,662

 
$
17.60

The following table summarizes all restricted share activity to employees and non-employee members of the Board of Trustees as of December 31, 2018 and changes during the year then ended:  
 
 
Number of Restricted
Shares
 
Weighted Average
Grant Date Fair
Value per share
Restricted shares outstanding at January 1, 2018
 
259,107

 
$
24.80

Shares granted
 
202,043

 
15.35

Shares forfeited
 
(19,189
)
 
22.51

Shares vested
 
(128,673
)
 
24.44

Restricted shares outstanding at December 31, 2018
 
313,288

 
$
18.93