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

 
$
111.56

Granted
158,687

 
$
111.38

Forfeited
(26,329
)
 
$
124.22

Settled
(55,418
)
 
$
129.75

Outstanding at March 31, 2017
379,764

 
$
107.95
Summary of Stock Option Activity
Stock option activity for the three months ended March 31, 2017 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2016
137,157

 
$
17.77

Granted
—

 
$
—

Exercised
(26,149
)
 
$
23.25

Forfeited
—

 
$
—

Outstanding at March 31, 2017
111,008

 
$
16.48