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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Stock-Based Compensation [Abstract]  
Fair value assumptions of stock options
 201120102009
Dividend yield  2.00%  3.00%  4.95%
Risk-free interest rate  2.27%  2.70%  1.87%
Expected volatility  47.24%  45.38%  36.00%
Weighted average expected life 6 years  6 years  6 years 
Weighted average per share fair value of options$ 5.56 $4.60 $3.60 
Summary of Company's Stock Option Activities
     Weighted AverageAggregate
  Weighted Average RemainingIntrinsic
Stock OptionsShares Exercise Price  Contractual Term Value (000s)
Outstanding at December 31, 2008 6,581,702$ 27.45    
Granted 975,548  17.05    
Exercised (945)  16.70    
Forfeited or expired (847,687)  25.73    
Outstanding at December 31, 2009 6,708,618$ 26.16 5.61$ -
Options exercisable at December 31, 2009 4,811,626$ 27.73 4.50$ -
Outstanding at December 31, 2009 6,708,618  26.16    
Granted 1,348,474  13.24    
Exercised (14,868)  12.71    
Forfeited or expired (740,766)  20.95    
Outstanding at December 31, 2010 7,301,458$ 24.33 5.01$ 2,460
Options exercisable at December 31, 2010 5,275,738$ 27.60 3.63$ 63
Outstanding at December 31, 2010 7,301,458  24.33    
Granted 1,624,369  14.20    
Exercised (23,437)  12.66    
Forfeited or expired (1,847,116)  24.51    
Outstanding at December 31, 2011 7,055,274$ 21.99 5.61$ 27
Options exercisable at December 31, 2011 4,623,935$ 26.10 4.01$ 7
        
Summary of Company's Nonvested Stock Option Activities
The following table summarizes information about the Corporation’s nonvested stock option activity for 2011, 2010, and 2009.
     
   Weighted Average
Stock OptionsShares  Grant Date Fair Value
Nonvested at December 31, 20081,811,165 $3.85
Granted975,548  3.60
Vested(650,629)  4.07
Forfeited(239,092)  4.26
Nonvested at December 31, 20091,896,992 $3.60
Nonvested at December 31, 20091,896,992 $3.60
Granted1,348,474  4.60
Vested(920,969)  3.93
Forfeited(298,777)  3.78
Nonvested at December 31, 20102,025,720 $4.09
Nonvested at December 31, 20102,025,720 $4.09
Granted1,624,369  5.56
Vested(955,454)  3.77
Forfeited(263,296)  4.85
Nonvested at December 31, 20112,431,339 $5.11
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)
The following table summarizes information about the Corporation’s restricted stock activity for 2011, 2010, and 2009.
     
   Weighted Average
Restricted StockShares  Grant Date Fair Value
Outstanding at December 31, 2008354,327 $26.75
Granted371,643  16.48
Vested(146,320)  27.96
Forfeited(52,519)  21.80
Outstanding at December 31, 2009527,131 $19.67
Outstanding at December 31, 2009527,131 $19.67
Granted604,343  12.38
Vested(205,239)  21.68
Forfeited(153,973)  17.12
Outstanding at December 31, 2010772,262 $13.94
Outstanding at December 31, 2010772,262 $13.94
Granted593,437  14.27
Vested(169,499)  17.74
Forfeited(182,435)  13.86
Outstanding at December 31, 20111,013,765 $13.79
Summary of stock options outstanding by range of exercise prices
The following table summarizes information about the Corporation’s stock options outstanding at December 31, 2011.
             
 Options Weighted Average Remaining  Options Weighted Average
 Outstanding  Exercise Price  Life (Years)   Exercisable  Exercise Price
             
Range of Exercise Prices:            
$0.00 — $10.004,000 $9.26 7.56  2,680 $9.26
$10.01 — $15.002,592,027  13.77 8.65  384,122  13.20
$15.01 — $20.00761,217  17.40 6.87  539,103  17.54
$20.01 — $25.001,504,303  23.40 2.98  1,504,303  23.40
$25.01 — $30.00452,037  29.04 2.05  452,037  29.04
Over $30.001,741,690  33.19 3.72  1,741,690  33.19
Total7,055,274 $21.99 5.61  4,623,935 $26.10