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Equity and Share-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Apr. 20, 2012
Restricted stock awards
   
Shares    
Non-vested shares outstanding at the beginning of the period 985,358  
Granted (in shares) 2,053,754  
Vested (in shares) (293,488)  
Forfeited (in shares) (20,482)  
Non-vested shares outstanding at the end of the period 2,725,142  
Weighted Average Grant Date Fair Value    
Non-vested shares outstanding at the beginning of the period (in dollars per share) $ 12.61  
Granted (in dollars per share) $ 7.29  
Vested (in dollars per share) $ 13.10  
Forfeited (in dollars per share) $ 8.06  
Non-vested shares outstanding at the end of the period (in dollars per share) $ 8.58  
Additional information    
Unrecognized expense (in dollars) $ 20.9  
Weighted-average period for over which unrecognized expense will be recognized 2 years 4 months 24 days  
LTIP
   
Additional information    
Shares available for issuance 3,945,351  
LTIP | Restricted stock awards
   
Restricted Stock Awards    
Number of shares registered for future issuance   6,563,435
Number of restricted common stock issued to directors, management and employees under the long term incentive plan 2,725,142  
Vesting period 3 years  
Percentage of awards vesting on each anniversary of the grant 33.00%  
LTIP | Restricted stock awards | Directors
   
Restricted Stock Awards    
Vesting period 1 year