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Share-Based Compensation (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2011
year
Dec. 31, 2010
year
Dec. 31, 2009
year
Dec. 31, 2008
year
Other disclosures        
Vesting period (in years) 3 years      
Long-Term Incentive Plan
        
Share-based Compensation        
Common stock authorized for issuance (in shares) 7,500,000      
Shares available for issuance 5,176,087      
Long-Term Incentive Plan | Stock Options
        
Share-based Compensation        
Common stock authorized for issuance (in shares) 1,000,000      
Stock option activity        
Options outstanding at the beginning of the period (in shares) 22,900 32,350 32,350  
Forfeited (in shares)   (3,149)    
Expired (in shares)   (6,301)    
Options outstanding at the end of the period (in shares) 22,900 22,900 32,350 32,350
Exercisable at the end of the period (in shares) 22,900      
Weighted-Average Exercise Price        
Options outstanding at the beginning of the period (in dollars per share) $ 18.03 $ 19.08 $ 19.08  
Forfeited (in dollars per share)   $ 21.61    
Expired (in dollars per share)   $ 21.61    
Options outstanding at the end of the period (in dollars per share) $ 18.03 $ 18.03 $ 19.08 $ 19.08
Exercisable at the end of the period (in dollars per share) $ 18.03      
Weighted-Average Remaining Contractual Term        
Options outstanding at the end of the period (in years) 7.35 8.35 8.21 9.21
Excercisable at the end of the period (in years) 7.35      
Other disclosures        
Weighted-average grant-date fair value of options granted (in dollars per share)       $ 8.97
Aggregate intrinsic value of options exercisable $ 70,000      
Compensation expense 8,000 9,000 118,000  
Long-Term Incentive Plan | Restricted Stock
        
Non-vested shares activity        
Non-vested at the beginning of the period (in shares) 1,369,182 177,060 78,666  
Granted (in shares) 826,959 1,307,378 202,257  
Vested (in shares) (557,355) (113,457) (100,763)  
Forfeited (in shares) (4,632) (1,799) (3,100)  
Non-vested at the end of the period (in shares) 1,634,154 1,369,182 177,060  
Weighted-Average Grant-Date Fair Value        
Non-vested at the beginning of the period (in dollars per share) $ 10.94 $ 6.59 $ 6.62  
Granted (in dollars per share) $ 18.79 $ 11.42 $ 6.68  
Vested (in dollars per share) $ 11.83 $ 9.79 $ 6.86  
Forfeited (in dollars per share) $ 8.67 $ 4.14 $ 4.14  
Non-vested at the end of the period (in dollars per share) $ 14.61 $ 10.94 $ 6.59  
Other disclosures        
Aggregate Intrinsic Value 30,608,000 20,784,000 1,215,000 315,000
Unrecognized compensation cost 19,500,000      
Weighted-average period for amortization of unrecognized compensation cost (in years) 2      
Aggregate fair value at the grant date of the shares that vested 6,600,000      
Aggregate fair value at grant date of unvested stock outstanding 23,900,000 15,000,000 1,200,000  
Compensation expense $ 9,800,000 $ 2,400,000 $ 800,000