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Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 35 Months Ended 54 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
May 31, 2016
May 31, 2016
Jul. 11, 2011
Share-based Compensation Arrangement by Share-based Payment Award                  
Stock-based Compensation $ (400,000) $ (700,000) $ (622,000) $ (1,631,000)          
Restricted Stock Shares Authorized                 900,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross           400,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 1,600,000   $ 1,600,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 13.57 $ 13.57 $ 13.57 $ 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 period, Number of Restricted Stock Awards (in shares) 274,400   276,800 351,000 351,000        
Unvested at beginning of period, Weighted Average Grant Date Fair Value (in dollars) $ 13.57   $ 13.57 $ 13.57 $ 13.57   $ 13.86 $ 13.57  
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,000   2,000 0 2,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 13.86   $ 13.86 $ 0.00          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (67,000)   (67,000) (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   $ 0.00 $ 0.00          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (6,400)   (8,800) 0          
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   $ 13.57 $ 0.00          
Outstanding (unvested) at end of period, Number of Restricted Stock Awards (in shares) 203,000 281,000 203,000 281,000 276,800 351,000      
Outstanding (unvested) at end of period, Weighted Average Grant Date Fair Value (in dollars) $ 13.57 $ 13.57 $ 13.57 $ 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 year 9 months 22 days   4 years 5 months 15 days  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights             .333 .20