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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2011
Stock-Based Compensation [Abstract]  
Fair value assumptions of stock options
                 
    2011     2010  
     
Dividend yield
    2.00 %     3.00 %
Risk-free interest rate
    2.30 %     2.70 %
Expected volatility
    47.20 %     45.38 %
Weighted average expected life
  6 years   6 years
Weighted average per share fair value of options
  $ 5.59     $ 4.60  
Summary of Company's Stock Option Activities
                                 
                    Weighted Average        
            Weighted Average     Remaining     Aggregate Intrinsic  
Stock Options   Shares     Exercise Price     Contractual Term     Value (000s)  
 
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
    1,560,238       14.26                  
Exercised
    (23,437 )     12.66                  
Forfeited or expired
    (1,306,848 )     24.53                  
                     
Outstanding at June 30, 2011
    7,531,411     $ 22.24       6.09     $ 827  
                     
Options exercisable at June 30, 2011
    4,958,251     $ 26.38       4.54     $ 278  
                     
Summary of Company's Nonvested Stock Option Activities
                 
            Weighted Average  
Stock Options   Shares     Grant Date Fair Value  
 
Nonvested at December 31, 2009
    1,896,992     $ 3.60  
Granted
    1,348,474       4.60  
Vested
    (920,969 )     3.93  
Forfeited
    (298,777 )     3.78  
 
             
Nonvested at December 31, 2010
    2,025,720     $ 4.09  
 
             
Granted
    1,560,238       5.59  
Vested
    (884,669 )     3.77  
Forfeited
    (128,129 )     4.78  
 
             
Nonvested at June 30, 2011
    2,573,160     $ 5.07  
 
             
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)
                 
            Weighted Average  
Restricted Stock   Shares     Grant Date Fair Value  
 
Outstanding at December 31, 2009
    527,131     $ 19.67  
Granted
    604,343       12.38  
Vested
    (205,239 )     21.68  
Forfeited
    (153,973 )     17.12  
 
             
Outstanding at December 31, 2010
    772,262     $ 13.94  
 
             
Granted
    558,601       14.42  
Vested
    (143,545 )     18.38  
Forfeited
    (91,114 )     13.65  
 
             
Outstanding at June 30, 2011
    1,096,204     $ 13.88