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Retirement and Share-based Compensation Plans Level 3 (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Changes in the number of stock options outstanding during the years ended December 31, 2012, 2011 and 2010 are as follows:
 
Number of
Shares
 
Weighted-Average
Exercise Price
per Share
 
Total
Exercise
Price
 
(Dollars in thousands, except per share data)
Outstanding at January 1, 2010
3,142,189

 
$
8.79

 
$
27,620

Granted
1,794,200

 
8.76

 
15,726

Canceled
(120,000
)
 
8.64

 
(1,037
)
Exercised
(695,539
)
 
8.80

 
(6,122
)
Outstanding at December 31, 2010
4,120,850

 
8.78

 
36,187

Granted
1,486,850

 
12.99

 
19,309

Canceled
(177,500
)
 
9.66

 
(1,714
)
Exercised
(585,350
)
 
8.00

 
(4,685
)
Outstanding at December 31, 2011
4,844,850

 
10.13

 
49,097

Granted
1,558,900

 
7.60

 
11,854

Canceled
(28,050
)
 
8.74

 
(245
)
Exercised
(643,250
)
 
8.77

 
(5,642
)
Outstanding at December 31, 2012
5,732,450

 
9.61

 
$
55,064
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information about stock options outstanding at December 31, 2012:
 
 
Stock Options Outstanding
 
Stock Options Vested
Range of
Exercise Prices
 
Number of
Awards
 
Remaining
Life (yrs)
 
Weighted-Average
Exercise Price
Per Share
 
Number of
Awards
 
Remaining
Life (yrs)
 
Weighted-Average
Exercise Price
Per Share
$5.07 - $9.16
 
1,500,000

 
3.59
 
$
7.70

 
1,500,000

 
3.59
 
$
7.70

$9.49 - $11.46
 
2,714,350

 
5.56
 
10.35

 
2,218,350

 
5.34
 
10.47

$11.88 - $14.34
 
1,518,100

 
5.37
 
12.97

 
1,413,100

 
5.12
 
13.03

$5.07 - $14.34
 
5,732,450

 
5.00
 
10.35

 
5,131,450

 
4.77
 
10.36
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions, Agent Stock Options [Table Text Block]
The fair value for each stock option granted to agents during the years ended December 31, 2012, 2011 and 2010 was estimated using a Black-Scholes option valuation model until the grant date, at which time the options are included as permanent equity, with the following assumptions:
 
Year Ended December 31,
 
2012
 
2011
 
2010
Average risk-free interest rate
0.51
%
 
0.58
%
 
1.44
%
Dividend yield
1.2
%
 
1.2
%
 
0.8
%
Average expected life (years)
3.75

 
3.75

 
3.75

Volatility
41.1
%
 
67.2
%
 
68.0
%
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value for each stock option granted to officers, directors and employees during the years ended December 31, 2012, 2011 and 2010 was estimated at the date of grant using a Black-Scholes option valuation model with the following assumptions:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
Directors and Retirement Eligible Employees
 
Non-Retirement Eligible Employees
 
Directors and Retirement Eligible Employees
 
Non-Retirement Eligible Employees
 
Directors and Retirement Eligible Employees
 
Non-Retirement Eligible Employees
Average risk-free interest rate
0.76
%
 
1.36
%
 
1.66
%
 
2.00
%
 
2.17
%
 
2.99
%
Dividend yield
1.1
%
 
1.3
%
 
0.8
%
 
1.0
%
 
0.8
%
 
0.8
%
Average expected life (years)
5

 
8

 
5

 
8

 
5

 
8

Volatility
62.5
%
 
50.9
%
 
66.1
%
 
52.0
%
 
75.7
%
 
75.7
%