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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock compensation expense and related net tax benefit
The following table presents a summary of the total share-based compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2018 and 2017:
 
($ in thousands)
 
Three Months Ended March 31,
 
2018
 
2017
Stock compensation costs
 
$
6,158

 
$
5,151

Related net tax benefits for stock compensation plans
 
$
4,778

 
$
4,414

 
Summary of activity for time-based and performance-based restricted stock units
The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the three months ended March 31, 2018 based on the target amount of awards:
 
 
 
Three Months Ended March 31, 2018
 
Time-Based RSUs
 
Performance-Based RSUs
 
Shares
 
Weighted-Average
Grant Date
Fair Value
 
Shares
 
Weighted-Average
Grant Date
Fair Value
Outstanding, at beginning of period
 
1,166,580

 
$
42.00

 
424,299

 
$
41.44

Granted
 
389,667

 
67.32

 
120,286

 
70.13

Vested
 
(312,413
)
 
39.97

 
(133,295
)
 
41.15

Forfeited
 
(29,223
)
 
44.62

 
—

 
—

Outstanding, at end of period
 
1,214,611

 
$
50.58

 
411,290

 
$
49.93