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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
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:
 
 
Six Months Ended June 30,
Restricted Shares and Performance Based Shares
 
2016
 
2015
Expected quarterly dividends per share
 
$
0.22

 
$
0.20

Risk-free interest rate
 
0.94
%
 
0.92
%
 
 
 
 
 
Market-Based Shares
 
 
 
 
Dividend yield
 
2.74
%
 
2.87
%
Expected volatility
 
20.44
%
 
18.73
%
Risk-free interest rate
 
0.97
%
 
1.00
%

The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options, for the six months ended June 30, 2016:
 
Restricted Stock
 
Stock Options
 
Shares
 
Weighted-
Average
Grant Date Fair Value
 
Shares
 
Weighted-
Average
Exercise Price
Outstanding at December 31, 2015
245,094

 
$
24.81

 
569,342

 
$
19.35

Granted
190,276

 
$
26.49

 

 
$

Exercised
(203,423
)
 
$
23.44

 
(236,635
)
 
$
27.76

Forfeited

 
$

 
(2,000
)
 
$
12.22

Expired

 
$

 
(8,200
)
 
$
24.85

Outstanding at June 30, 2016
231,947

 
$
27.40

 
322,507

 
$
13.08

The following table provides additional information concerning restricted stock activity, including performance-based and market-based shares, and stock options:
 
 
Six Months Ended June 30,
Restricted Stock
 
2016
 
2015
Weighted-average grant date fair value
 
$
26.49

 
$
20.34

Total fair value of restricted shares that vested (in thousands)
 
$
4,768

 
$
6,470

 
 
 
 
 
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)
 
$
1,145

 
$
1,759