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Equity Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used in Calculation of Fair Value
Below were the assumptions used in the Monte Carlo calculation:
 
June 30, 2018
 
June 30, 2017
Expected volatility
34.8%
 
33.6%
Expected term (in years)
3.0
 
3.0
Risk-free interest rate
2.28%
 
1.38%
Summary of Activity Under Stock Option Plans
The following table summarizes the change in number of stock options outstanding for the six months ended June 30, 2018:
 
Options Outstanding
 
Weighted- Average Exercise Price Per Share
 
Weighted-Average Remaining Contractual Life in Years
 
Aggregate Intrinsic Value
Outstanding at December 31, 2017
33,283

 
$
36.40

 
2.2
 
$
4,177,655

Options exercised
(17,683
)
 
$
39.48

 
 
 
 
Options forfeited
—

 
$
—

 
 
 
 
Options outstanding at June 30, 2018
15,600

 
$
32.91

 
2.5
 
$
1,225,308

Options exercisable at June 30, 2018
15,600

 
$
32.91

 
2.5
 
$
1,225,308

Options vested at June 30, 2018
15,600

 
$
32.91

 
2.5
 
$
1,225,308
Time Based Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activities
The following table summarizes the change in number of time-based restricted stock units outstanding for the six months ended June 30, 2018:
 
Time-Based
Restricted Stock Units
Awards outstanding at December 31, 2017
173,331

Awards granted
41,310

Stock issued
(77,513
)
Awards forfeited
(14,627
)
Awards outstanding at June 30, 2018
122,501
Performance-Based Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activities
The following table summarizes the change in number of performance-based restricted stock units outstanding for the six months ended June 30, 2018:
 
Performance-Based
Restricted Stock Units
Awards outstanding at December 31, 2017
169,202

Awards granted
72,160

Stock issued
(81,230
)
Awards forfeited
(17,489
)
Awards outstanding at June 30, 2018
142,643
Deferred Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activities
The following table summarizes the change in number of deferred stock units outstanding during the six months ended June 30, 2018:
 
Deferred Stock Units
Awards outstanding at December 31, 2017
9,250

Awards granted
8,400

Stock issued
(8,400
)
Awards outstanding at June 30, 2018
9,250