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Share-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of restricted stock activity
The following is a summary of restricted stock activity for the nine months ended September 30, 2015: 
(shares in thousands)
Shares
 
Weighted
Average
Grant Date
Fair Value /Share
Outstanding at January 1, 2015
1,171

 
$
31.80

Granted
411

 
35.84

Vested
(345
)
 
27.82

Forfeited
(105
)
 
32.50

Outstanding at September 30, 2015
1,132

 
$
34.43
Summary of performance based share grants
The following is a summary of performance-based share grants for the nine months ended September 30, 2015:
(shares in thousands)
Shares
 
Weighted
Average
Grant Date
Fair Value /Share
Outstanding at January 1, 2015
124

 
$
33.95

Granted
103

 
35.91

Vested
—

 
—

Forfeited
(48
)
 
33.11

Outstanding at September 30, 2015
179

 
$
35.30
Summary of the changes in outstanding stock options
The following is a summary of the changes in outstanding stock options for the nine months ended September 30, 2015: 
(shares in thousands)
Shares
 
Weighted
Average
Exercise
Price / Share
 
Weighted  Average
Remaining
Contractual
Term (Years)
Outstanding at January 1, 2015
2,989

 
$
28.60

 
6.5
Granted
708

 
35.88

 
10.0
Exercised
(519
)
 
26.85

 
5.6
Forfeited and expired
(178
)
 
34.04

 
8.5
Outstanding at September 30, 2015
3,000

 
$
30.30

 
6.7
Options exercisable at September 30, 2015
1,939

 
$
27.44

 
5.4
Vested and expected to vest as of September 30, 2015
2,877

 
$
30.09

 
6.6
Weighted-average assumptions for 2015 grants
The following are weighted-average assumptions for 2015 grants:
Dividend yield
1.57

%
Volatility
27.77

%
Risk-free interest rate
1.64

%
Expected term (in years)
5.58

 
Weighted-average fair value / share
$
8.49