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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2017 and 2016:
 
($ in thousands)
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Stock compensation costs
 
$
4,964

 
$
4,635

 
$
10,115

 
$
9,210

Related net tax benefit for stock compensation plans
 
$
49

 
$
19

 
$
4,463

 
$
1,005

 
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 six months ended June 30, 2017 based on the target amount of awards:
 
 
 
Six Months Ended June 30, 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
 
336,582

 
54.47

 
131,597

 
56.59

Vested
 
(284,479
)
 
36.80

 
(118,044
)
 
36.85

Forfeited
 
(94,346
)
 
39.86

 
—

 
—

Outstanding at end of period
 
1,176,471

 
$
40.70

 
424,299

 
$
41.44