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Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units Activity
RSU activity for the three months ended March 31, 2016 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2015
191,617

 
$
156.66

Granted
143,937

 
$
75.05

Forfeited
(130
)
 
$
140.68

Settled
(40,332
)
 
$
167.81

Outstanding at March 31, 2016
295,092

 
$
115.34
Summary of Stock Option Activity
Stock option activity for the three months ended March 31, 2016 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2015
156,636

 
$
18.78

Granted
—

 
$
—

Exercised
(9,783
)
 
$
38.25

Forfeited
—

 
$
—

Outstanding at March 31, 2016
146,853

 
$
17.48