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Share-Based Compensation (Details 3) (USD $)
 1 Months Ended 12 Months Ended
May 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Other disclosures          
Additional share based compensation incurred on modification of awards   $ 9,924,000      
Liability for unvested restricted share awards   51,154,000 20,849,000    
Restricted Shares
          
Other disclosures          
Liability for unvested restricted share awards   19,500,000      
Cash paid to settle liability-classified awards upon vesting   22,200,000      
Restricted stock units
          
Other disclosures          
Vesting period   3 years      
Portion of stock awards vested per year for Company employees   0.3333      
Restricted stock units | Certain executive officers
          
Other disclosures          
Vesting period   1 year      
Restricted stock units | Mr. Lipinski
          
Non-vested shares activity          
Granted (in shares)   62,920      
Long-Term Incentive Plan
          
Share-based Compensation          
Common stock authorized for issuance (in shares)   7,500,000      
Shares available for issuance   6,787,341      
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 22,900 32,350  
Exercised (in shares) (22,900) (22,900)      
Forfeited (in shares)       (3,149)  
Expired (in shares)       (6,301)  
Options outstanding at the end of the period (in shares)     22,900 22,900  
Weighted-Average Exercise Price          
Options outstanding at the beginning of the period (in dollars per share)   $ 18.03 $ 18.03 $ 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  
Weighted-Average Remaining Contractual Term          
Options outstanding at the end of the period (in years)     7.35 8.35 8.21
Other disclosures          
Compensation expense   0 8,000 9,000  
Long-Term Incentive Plan | Restricted Stock
          
Other disclosures          
Weighted-average period for amortization of unrecognized compensation cost (in years)   1      
Long-Term Incentive Plan | Restricted Shares
          
Non-vested shares activity          
Non-vested at the beginning of the period (in shares)   1,634,154 1,369,182 177,060  
Granted (in shares)   318,508 826,959 1,307,378  
Vested (in shares)   (740,811) (557,355) (113,457)  
Forfeited (in shares)   (66,240) (4,632) (1,799)  
Non-vested at the end of the period (in shares)   1,145,611 1,634,154 1,369,182  
Weighted-Average Grant-Date Fair Value          
Non-vested at the beginning of the period (in dollars per share)   $ 14.61 $ 10.94 $ 6.59  
Granted (in dollars per share)   $ 43.66 $ 18.79 $ 11.42  
Vested (in dollars per share)   $ 13.59 $ 11.83 $ 9.79  
Forfeited (in dollars per share)   $ 16.54 $ 8.67 $ 4.14  
Non-vested at the end of the period (in dollars per share)   $ 23.24 $ 14.61 $ 10.94  
Other disclosures          
Aggregate Intrinsic Value   55,894,000 30,608,000 20,784,000 1,215,000
Vesting period   3 years      
Offer price per share received as cash settlement on restricted stock awards vested in 2012   $ 30.00      
Number of non-transferable contingent cash payments right for each restricted stock awards vested in 2012 (in shares)   1      
Additional share based compensation incurred on modification of awards   12,400,000      
Unrecognized compensation cost   19,900,000      
Aggregate fair value at the grant date of the shares that vested   10,100,000      
Aggregate fair value at grant date of unvested stock outstanding   26,600,000 23,900,000 15,000,000  
Compensation expense   $ 36,900,000 $ 9,800,000 $ 2,400,000