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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
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
 
2018
 
2017
Expected quarterly dividends per share
 
$
0.2650

 
$
0.2425

Risk-free interest rate
 
2.38
%
 
1.50
%
 
 
 
 
 
Market-Based Shares
 
 
 
 
Dividend yield
 
2.96
%
 
2.67
%
Expected volatility
 
19.12
%
 
20.80
%
Risk-free interest rate
 
2.36
%
 
1.54
%

The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options, for the nine months ended September 30, 2018:
 
Restricted Stock
 
Stock Options
 
Shares
 
Weighted-
Average
Grant Date Fair Value
 
Shares
 
Weighted-
Average
Exercise Price
Outstanding at December 31, 2017
189,045

 
$
31.11

 
193,441

 
$
9.98

Granted
221,062

 
$
29.65

 

 
$

Exercised
(235,868
)
 
$
28.44

 
(109,441
)
 
$
8.56

Forfeited
(6,054
)
 
$
31.37

 

 
$

Expired

 
$

 

 
$

Outstanding at September 30, 2018
168,185

 
$
32.93

 
84,000

 
$
11.82

The following table provides additional information concerning restricted stock activity, including performance-based and market-based shares, and stock options:
 
 
Nine Months Ended September 30,
Restricted Stock
 
2018
 
2017
Weighted-average grant date fair value
 
$
29.65

 
$
23.06

Total fair value of restricted shares that vested (in thousands)
 
$
8,493

 
$
5,666

 
 
 
 
 
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)
 
$
3,016

 
$
2,234