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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016:
 
 
 
 
 
($ in thousands)
 
Three Months Ended
March 31,
 
2017
 
2016
Stock compensation costs
 
$
5,151

 
$
4,575

Related net tax benefit for stock compensation plans
 
$
4,414

 
$
986

 
 
 
 
 
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, 2017 based on the target amount of awards:
 
 
 
Three Months Ended March 31, 2017
 
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
 
1,218,714

 
$
35.92

 
410,746

 
$
35.27

Granted
 
330,762

 
54.49

 
131,597

 
56.59

Vested
 
(279,549
)
 
36.84

 
(118,044
)
 
36.85

Forfeited
 
(61,193
)
 
39.25

 
—

 
—

Outstanding at end of period
 
1,208,734

 
$
40.62

 
424,299

 
$
41.44