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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Awards
The following table provides additional information concerning stock options, and restricted stock activity including performance-based and market-based shares:
 
 
Year Ended December 31,
Restricted Stock
 
2015
 
2014
 
2013
Weighted-average grant date fair value
 
$
20.34

 
$
21.27

 
$
20.03

Total fair value of restricted shares that vested (in thousands)
 
$
6,507

 
$
4,933

 
$
4,395

 
 
 
 
 
 
 
Stock Options
 
 
 
 
 
 
Weighted-average grant date fair value of options granted
 
$

 
$

 
$

Total fair value of options that vested (in thousands)
 
$

 
$

 
$
625

Total intrinsic value of options exercised (in thousands)
 
$
2,350

 
$
2,473

 
$
2,721

The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
 
 
Year Ended December 31,
Restricted Shares and Performance-Based Shares
 
2015
 
2014
 
2013
 
Expected quarterly dividends per share
 
$
0.200

 
$
0.185

 
$
0.165

 
Risk-free interest rate
 
0.92
%
 
0.62
%
 
0.34
%
 
 
 
 
 
 
 
 
 
Market-Based Shares
 
 
 
 
 
 
 
Dividend yield
 
2.87
%
 
2.82
%
 
2.86
%
 
Expected volatility
 
18.73
%
 
25.11
%
 
25.11
%
 
Risk-free interest rate
 
1.00
%
 
0.64
%
 
0.36
%
 
The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options:
 
 
Restricted Stock
Stock Options
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Shares
 
Weighted
Average
Exercise
Price
Outstanding at December 31, 2014
 
258,770

 
$
22.31

920,505

 
$
20.39

Granted
 
340,020

 
$
20.34


 
$

Exercised
 
(349,635
)
 
$
18.61

(280,612
)
 
$
20.13

Forfeited
 
(4,061
)
 
$
24.81

(1,000
)
 
$
30.50

Expired
 

 

(69,551
)
 
$
28.02

Outstanding at December 31, 2015
 
245,094

 
$
24.81

569,342

 
$
19.35