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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
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
 
2014
 
2013
Expected quarterly dividends per share
 
$
0.185

 
$
0.165

Risk-free interest rate
 
0.71
%
 
0.38
%
 
 
 
 
 
Market-Based Shares
 
 
 
 
Dividend yield
 
2.82
%
 
2.86
%
Expected volatility
 
25.11
%
 
25.11
%
Risk-free interest rate
 
0.64
%
 
0.36
%

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, 2014:
 
Stock Option Shares
 
Weighted-
Average
Exercise
Price
 
Restricted Stock
 
Weighted-
Average
Grant Date Fair Value
Outstanding at beginning of period
1,343,666

 
$
20.63

 
315,305

 
$
17.87

Granted
—

 
$
—

 
223,348

 
$
20.79

Exercised
(182,407
)
 
$
17.86

 
(262,358
)
 
$
16.53

Forfeited
(17,151
)
 
$
26.43

 
—

 
$
—

Expired
(13,501
)
 
$
25.82

 
—

 
$
—

Outstanding at end of period
1,130,607

 
$
20.92

 
276,295

 
$
21.55

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,
Stock Options
 
2014
 
2013
Weighted-average grant date fair value of options granted
 
$
—

 
$
—

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

 
$
620

Total intrinsic value of options exercised (in thousands)
 
$
1,469

 
$
1,824

 
 
 
 
 
Restricted Stock
 
 
 
 
Weighted-average grant date fair value
 
$
20.79

 
$
19.82

Total fair value of restricted shares that vested (in thousands)
 
$
4,336

 
$
3,871