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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation [Abstract]  
Summary Of The Status Of Nonvested Share Awards
A summary of the status of the Company’s nonvested share awards as of September 30, 2015, and changes during the nine month period then ended, is presented below.
 
 
 

Shares
 Weighted Average Grant Date Fair Value
Nonvested at January 1, 2015
1,259,689

$34.41
Granted
215,245

41.69
Vested
(141,877
)
30.11
Forfeited
(15,936
)
34.79
Nonvested at September 30, 2015
1,317,121

$36.05
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The current year per share average fair value and the model assumptions are shown in the table below.
        
Weighted per share average fair value at grant date

$7.58

Assumptions:
 
Dividend yield
2.2
%
Volatility
21.3
%
Risk-free interest rate
1.8
%
Expected term
7.2 years
Summary Of Option Activity
A summary of option activity during the first nine months of 2015 is presented below.
(Dollars in thousands, except per share data)
Shares
Weighted Average Exercise Price
Outstanding at January 1, 2015
68,675

$29.27
Granted
—

—

Forfeited
—

—

Expired
—

—

Exercised
(68,675
)
29.27
Outstanding at September 30, 2015
$
—

$
—
Summary Of SAR Activity
A summary of SAR activity during the first nine months of 2015 is presented below.
 
 
 
 
(Dollars in thousands, except per share data)
Rights
Weighted Average Exercise Price
Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value
Outstanding at January 1, 2015
1,780,578

$33.96
 
 
Granted
240,267

41.40
 
 
Forfeited
(6,182
)
39.04

 
 
Expired
(1,076
)
37.31

 
 
Exercised
(411,126
)
32.94
 
 
Outstanding at September 30, 2015
1,602,461

$35.32
4.4 years
$
16,412