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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
 
 
Three Months Ended March 31,
Restricted Shares and Performance Based Shares
 
2015
 
2014
Expected quarterly dividends per share
 
$
0.200

 
$
0.185

Risk-free interest rate
 
1.07
%
 
0.71
%
 
 
 
 
 
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 three months ended March 31, 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
317,756

 
$
19.93

 
—

 
$
—

Exercised
(327,479
)
 
$
18.34

 
(149,277
)
 
$
21.34

Forfeited
—

 
$
—

 
(5,300
)
 
$
30.50

Expired
—

 
$
—

 
—

 
$
—

Outstanding at March 31, 2015
249,047

 
$
24.48

 
765,928

 
$
19.97

The following table provides additional information concerning stock options and restricted stock activity, including performance-based and market-based shares:
 
 
Three Months Ended March 31,
Restricted Stock
 
2015
 
2014
Weighted-average grant date fair value
 
$
19.93

 
$
20.79

Total fair value of restricted shares that vested (in thousands)
 
$
6,005

 
$
4,336

 
 
 
 
 
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)
 
$
1,138

 
$
1,469