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Stock and Other Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Summary of the activity under the Incentive Plan the previous directors' plan
A summary of the activity under the Incentive Plan and the previous directors' plan and related information for the three years in the period ended December 31, 2012 follows: 
 
2012
 
2011
 
2010
Stock-based awards, beginning of year
1,430,675

 
1,379,243

 
1,224,779

Granted
397,917

 
106,569

 
175,412

Vested
(58,531
)
 
(44,211
)
 
(20,948
)
Forfeited

 
(10,926
)
 

Stock-based awards, end of year
1,770,061

 
1,430,675

 
1,379,243

Weighted-average grant date fair value of:
 
 
 
 
 
Stock-based awards, beginning of year
$
24.65

 
$
24.71

 
$
25.16

Stock-based awards granted during the year
$
22.35

 
$
21.64

 
$
21.19

Stock-based awards vested during the year
$
20.97

 
$
20.13

 
$
22.60

Stock-based awards forfeited during the year
$

 
$
21.00

 
$

Stock-based awards, end of year
$
24.23

 
$
24.65

 
$
24.71

Grant date fair value of shares granted during the year
$
8,894,424

 
$
2,305,848

 
$
3,600,160

Summary of the Employee Stock Purchase Plan activity
A summary of the Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2012 is as follows:
 
2012
 
2011
 
2010
Outstanding, beginning of year
425,196

 
392,517

 
335,608

Granted
327,936

 
261,960

 
256,080

Exercised
(59,163
)
 
(13,901
)
 
(9,131
)
Forfeited
(78,202
)
 
(49,173
)
 
(53,504
)
Expired
(182,315
)
 
(166,207
)
 
(136,536
)
Outstanding and exercisable, end of year
433,452

 
425,196

 
392,517

Weighted-average exercise price of:
 
 
 
 
 
Options outstanding, beginning of year
$
15.80

 
$
17.99

 
$
18.24

Options granted during the year
$
15.80

 
$
17.99

 
$
18.24

Options exercised during the year
$
16.18

 
$
16.31

 
$
18.19

Options forfeited during the year
$
16.74

 
$
17.12

 
$
18.69

Options expired during the year
$
18.24

 
$
19.34

 
$
19.80

Options outstanding, end of year
$
16.78

 
$
15.80

 
$
17.99

Weighted-average fair value of options granted during the year (calculated as of the grant date)
$
4.13

 
$
7.61

 
$
8.07

Intrinsic value of options exercised during the year
$
439,645

 
$
38,784

 
$
29,037

Intrinsic value of options outstanding and exercisable (calculated as of December 31)
$
3,132,506

 
$
1,186,297

 
$
1,248,204

Exercise prices of options outstanding (calculated as of December 31)
$
16.78

 
$
15.80

 
$
17.99

Weighted-average contractual life of outstanding options (calculated as of December 31, in years)
0.8

 
0.8

 
0.8

Fair value of options issued based on weighted-average assumptions
 
2012
 
2011
 
2010
Risk-free interest rates
0.25
%
 
0.61
%
 
1.14
%
Expected dividend yields
6.17
%
 
5.35
%
 
5.68
%
Expected life (in years)
1.46

 
1.48

 
1.50

Expected volatility
30.3
%
 
64.8
%
 
69.5
%
Expected forfeiture rates
70
%
 
91
%
 
91
%