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Stock-Based Compensation (Details) (USD $)
12 Months Ended 54 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
May 31, 2016
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award          
Stock-based Compensation $ 150,000 $ 0 $ 0 $ 4,800,000  
Restricted Stock Shares Authorized         900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 4,600,000        
Stock Issued During Period, Shares, Restricted Stock Award, Gross 351,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 13.57 $ 0.00      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]          
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars) $ 0.00     $ 13.57  
Unvested at beginning of year, Number of Restricted Stock Awards (in shares) 0        
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 351,000 0      
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 13.57 $ 0.00      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 0.00        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) 1.8        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 0.00