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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2013
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:

 
 
Nine Months Ended September 30,
Restricted Shares and Performance Based Shares
 
2013
 
2012
Expected quarterly dividends per share
 
$
0.165

 
$
0.145

Risk-free interest rate
 
0.34
%
 
0.65
%
 
 
 
 
 
Market-Based Shares
 
 
 
 
Dividend yield
 
2.86
%
 
3.45
%
Expected volatility
 
25.11
%
 
43.98
%
Risk-free interest rate
 
0.36
%
 
1.04
%

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, 2013:
 
Stock Option Shares
 
Weighted-
Average
Exercise
Price
 
Restricted Stock
 
Weighted-
Average
Grant Date Fair Value
Outstanding at beginning of period
1,992,700

 
$
20.72

 
353,722

 
$
14.03

Granted

 
$

 
249,113

 
$
20.03

Exercised
(260,579
)
 
$
13.43

 
(275,988
)
 
$
15.92

Forfeited

 
$

 
(8,366
)
 
$
18.37

Expired
(292,644
)
 
$
27.23

 

 
$

Outstanding at end of period
1,439,477

 
$
20.72

 
318,481

 
$
17.88

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,
Stock Options
 
2013
 
2012
Weighted-average grant date fair value of options granted
 
$

 
$

Total fair value of options that vested (in thousands)
 
$
625

 
$
1,058

Total intrinsic value of options exercised (in thousands)
 
$
2,466

 
$
4,515

 
 
 
 
 
Restricted Stock
 
 
 
 
Weighted-average grant date fair value
 
$
20.03

 
$
15.63

Total fair value of restricted shares that vested (in thousands)
 
$
4,395

 
$
4,755