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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock-based Compensation Expense
Stock-based compensation expense is summarized as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
($ in thousands)
 
 
 
 
 
 
 
Stock-based compensation expense
$
5,000

 
$
4,841

 
$
16,384

 
$
16,914
Summary of Restricted Stock Units Activity
RSU activity for the nine months ended September 30, 2019 is summarized as follows: 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2018
552,238

 
$
111.49

Granted
181,367

 
$
108.42

Forfeited
(22,724
)
 
$
94.37

Settled
(158,916
)
 
$
96.33

Outstanding at September 30, 2019
551,965

 
$
115.55
Summary of Stock Option Activity

Stock option activity for the nine months ended September 30, 2019 is summarized as follows: 
 
Number
of Shares
 
Weighted
Average
Exercise Price
Outstanding at December 31, 2018
76,751

 
$
12.86

Exercised
(66,120
)
 
$
9.79

Outstanding, vested and exercisable at June 30, 2019
10,631

 
$
31.96