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Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Restricted Stock Unit Activity
The following table summarizes the activity of our time-vested restricted stock units (“RSUs”):
 
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
Beginning balance
 
175,100

 
$
27.66

 
133,853

 
$
20.13

   Granted
 
40,844

 
$
63.30

 
68,109

 
$
32.38

   Vested
 
(36,486
)
 
$
15.70

 
(12,323
)
 
$
15.63

   Forfeited
 
(5,941
)
 
$
34.31

 
(9,219
)
 
$
20.09

Ending balance
 
173,517

 
$
38.34

 
180,420

 
$
25.06

Schedule of Performance Based Stock Activity
The following table summarizes the activity of our PSUs for the nine months ended September 30, 2018:
Period Granted
 
Performance Period
 
Target PSUs Outstanding at December 31, 2017
 
Target PSUs Granted
 
Target PSUs Vested
 
Target PSUs Forfeited
 
Target PSUs Outstanding at September 30, 2018
 
Weighted Average Grant Date Fair Value
2015
 
2015 - 2017
 
120,971

 

 
(120,971
)
 

 

 
$
13.34

2016
 
2016 - 2018
 
87,605

 

 

 
(3,929
)
 
83,676

 
$
21.79

2017
 
2017 - 2019
 
111,035

 

 

 
(2,788
)
 
108,247

 
$
31.64

2018
 
2018 - 2020
 

 
61,898

 

 

 
61,898

 
$
64.60

Total
 
 
 
319,611

 
61,898

 
(120,971
)
 
(6,717
)
 
253,821