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Common Stock (Restricted Stock) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Minimum [Member]
     
Weighted-Average Fair Value - Date of Grant      
Vesting period in years   3 years 6 months 3 years 4 months 24 days
Maximum [Member]
     
Weighted-Average Fair Value - Date of Grant      
Vesting period in years   4 years 6 years 3 months 18 days
Restricted stock [Member]
     
Shares      
Non-vested at January 1, 2012 1,445,858    
Granted 750,476    
Vested (842,730)    
Forfeited (29,314)    
Non-vested at December 31, 2012 1,324,290 1,445,858  
Weighted-Average Fair Value - Date of Grant      
Non-vested at January 1, 2012 $ 6.64    
Granted $ 11.03 $ 8.79 $ 1.88
Vested $ 6.51    
Forfeited $ 10.84    
Non-vested at December 31, 2012 $ 9.15 $ 6.64  
Fair value of vested restricted stock $ 5.4 $ 7.2 $ 4.2
Unrecognized compensation expense related to non-vested restricted stock $ 7.5    
Weighted-average period unrecognized compensation expense is expected to be recognized 1 year 9 months    
Restricted stock [Member] | Minimum [Member]
     
Weighted-Average Fair Value - Date of Grant      
Vesting period in years 3 years    
Restricted stock [Member] | Maximum [Member]
     
Weighted-Average Fair Value - Date of Grant      
Vesting period in years 4 years    
2010 Plan [Member] | Restricted stock [Member]
     
Shares      
Granted 750,476    
2010 Plan [Member] | Restricted Stock, Time-vesting [Member]
     
Weighted-Average Fair Value - Date of Grant      
Percent of time-vesting restricted stock awards 74.00%