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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Activity
The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
 
 
Nine Months Ended September 30,
Restricted Shares and Performance Based Shares
 
2015
 
2014
Expected quarterly dividends per share
 
$
0.200

 
$
0.185

Risk-free interest rate
 
0.92
%
 
0.62
%
 
 
 
 
 
Market-Based Shares
 
 
 
 
Dividend yield
 
2.87
%
 
2.82
%
Expected volatility
 
18.73
%
 
25.11
%
Risk-free interest rate
 
1.00
%
 
0.64
%

The following table summarizes activity in stock options and restricted stock awards, including performance-based and market-based shares, for the nine months ended September 30, 2015:
 
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
(349,468
)
 
$
18.61

 
(215,945
)
 
$
19.98

Forfeited
(4,061
)
 
$
24.81

 
(1,000
)
 
$
30.50

Expired
—

 
$
—

 
(66,201
)
 
$
27.90

Outstanding at September 30, 2015
245,261

 
$
24.81

 
637,359

 
$
19.54

The following table provides additional information concerning stock options and restricted stock activity, including performance-based and market-based shares:
 
 
Nine Months Ended September 30,
Restricted Stock
 
2015
 
2014
Weighted-average grant date fair value
 
$
20.34

 
$
21.27

Total fair value of restricted shares that vested (in thousands)
 
$
6,503

 
$
4,929

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

 
$
—

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

 
$
—

Total intrinsic value of options exercised (in thousands)
 
$
1,814

 
$
2,199