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Earnings Per Share (Details Textual)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Convertible Preferred Stock, Shares Issuable upon Conversion the Company's Class N preferred shares, each of which is convertible to 40 common shares    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,908,198 3,142,031 3,141,198
Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount   2,727,031