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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units Activity
RSU activity for the six months ended June 30, 2018 is summarized as follows: 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2017
483,021

 
$
104.16

Granted
175,284

 
$
133.37

Settled
(80,032
)
 
$
110.81

Outstanding at June 30, 2018
578,273

 
$
112.16
Summary of Stock Option Activity
Stock option activity for the six months ended June 30, 2018 is summarized as follows: 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2017
109,808

 
$
16.44

Exercised
(22,245
)
 
$
31.38

Outstanding at June 30, 2018
87,563

 
$
12.64