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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 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 provides additional information concerning stock options, and restricted stock activity including performance-based and market-based shares:
 
 
Year Ended December 31,
Restricted Stock
 
2014
 
2013
 
2012
Weighted-average grant date fair value
 
$
21.27

 
$
20.03

 
$
16.75

Total fair value of restricted shares that vested (in thousands)
 
$
4,933

 
$
4,395

 
$
5,099

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

 
$
—

 
$
—

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

 
$
625

 
$
1,054

Total intrinsic value of options exercised (in thousands)
 
$
2,473

 
$
2,721

 
$
6,356

The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
 
 
Year Ended December 31,
Restricted Shares and Performance-Based Shares
 
2014
 
2013
 
2012
 
Expected quarterly dividends per share
 
$
0.185

 
$
0.165

 
$
0.145

 
Risk-free interest rate
 
0.62
%
 
0.34
%
 
1.22
%
 
 
 
 
 
 
 
 
 
Market-Based Shares
 
 
 
 
 
 
 
Dividend yield
 
2.82
%
 
2.86
%
 
3.45
%
 
Expected volatility
 
25.11
%
 
25.11
%
 
43.98
%
 
Risk-free interest rate
 
0.64
%
 
0.36
%
 
1.04
%
 
The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options:
 
 
Restricted Stock
Stock Options
 
 
Shares
 
Weighted-Average Grant Date Fair Value
Shares
 
Weighted
Average
Exercise
Price
Outstanding at December 31, 2013
 
315,305

 
$
17.87

1,343,666

 
$
20.63

Granted
 
242,164

 
$
21.27

—

 
$
—

Exercised
 
(295,423
)
 
$
16.70

(345,426
)
 
$
20.04

Forfeited
 
(3,276
)
 
$
22.46

(17,151
)
 
$
26.43

Expired
 
—

 
—

(60,584
)
 
$
27.98

Outstanding at December 31, 2014
 
258,770

 
$
22.31

920,505

 
$
20.39