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Share-Based Compensation - Summary of the Status of Restricted Shares (Details) (Restricted stock [Member], USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Restricted stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested Shares, beginning balance (in shares) 143,031  
Nonvested Shares, Granted (in shares) 0 62,105
Nonvested Shares, Vested (in shares) (52,499)  
Nonvested Shares, Forfeited or expired (in shares) 0  
Nonvested Shares, ending balance (in shares) 90,532 143,031
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted Average Exercise Price per Share, Beginning balance $ 5.07  
Weighted Average Exercise Price per Share, Granted $ 0.00 $ 5.39
Weighted Average Exercise Price per Share, Vested $ 4.68  
Weighted Average Exercise Price per Share, Forfeited or expired $ 0.00  
Weighted Average Exercise Price per Share, Ending balance $ 8.00 $ 5.07