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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units Activity
RSU activity for the nine months ended September 30, 2017 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2016
302,824

 
$
111.56

Granted
274,392

 
$
108.25

Forfeited
(29,134
)
 
$
121.06

Settled
(78,423
)
 
$
140.86

Outstanding at September 30, 2017
469,659

 
$
104.14
Summary of Stock Option Activity
Stock option activity for the nine months ended September 30, 2017 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2016
137,157

 
$
17.77

Granted
—

 
$
—

Exercised
(26,749
)
 
$
23.43

Forfeited
—

 
$
—

Outstanding at September 30, 2017
110,408

 
$
16.40