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Stock Based Compensation RSUs (Details)
3 Months Ended
Dec. 31, 2012
Mar. 31, 2013
2010 Plan [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested balance (in shares)   23,478
Vested (in shares) (39,126)  
Nonvested balance (in shares)   23,478