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Stock-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 54 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
years
May 31, 2016
years
Jun. 30, 2012
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award              
Stock-based Compensation $ (400,000) $ (2,000,000) $ 0        
Restricted Stock Shares Authorized             900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2,600,000 $ 2,600,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 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) 281,000 351,000          
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 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 0 (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 (4,000) (4,000)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value           $ 13.57  
Outstanding (unvested) at end of year, Number of Restricted Stock Awards (in shares) 277,000 277,000   351,000      
Outstanding (unvested) at end of year, Weighted Average Grant Date Fair Value (in dollars) $ 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