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Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 54 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
years
May 31, 2016
years
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award            
Stock-based Compensation $ (700,000) $ (1,631,000) $ 0      
Restricted Stock Shares Authorized           900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 3,000,000 $ 3,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 13.57 $ 13.57   $ 13.57    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]            
Unvested at beginning of year, Number of Restricted Stock Awards (in shares)   351,000        
Unvested at beginning of year, Weighted Average Grant Date Fair Value (in dollars)   $ 13.57     $ 13.57  
Stock Issued During Period, Shares, Restricted Stock Award, Gross   0   351,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.00        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (70,000)        
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        
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 $ 0.00        
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 281,000 281,000   351,000    
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 13.57 $ 13.57   $ 13.57    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years)       1.8 4.5