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Stockholders' Equity (Schedule of Non-vested restricted shares granted and vested) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Balance 63,777 61,642
Granted 57,016 52,139
Vested (57,577) (49,805)
Cancelled (411) (5,504)
Stock Dividends   5,305
Balance 62,805 63,777