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Stockholders' Equity (Schedule of Non-vested restricted shares granted and vested) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Balance 62,805 63,777
Granted 74,083 57,016
Vested   (57,577)
Cancelled (784) (411)
Balance 136,104 62,805