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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Units Activity
RSU activity for the six months ended June 30, 2016 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2015
191,617

 
$
156.66

Granted
149,989

 
$
75.22

Forfeited
(1,193
)
 
$
127.42

Settled
(50,773
)
 
$
170.75

Outstanding at June 30, 2016
289,640

 
$
112.14
Summary of Stock Option Activity
Stock option activity for the six months ended June 30, 2016 is summarized as follows:
 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2015
156,636

 
$
18.78

Granted
—

 
$
—

Exercised
(11,417
)
 
$
34.97

Forfeited
—

 
$
—

Outstanding at June 30, 2016
145,219

 
$
17.51