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Basic and Diluted Earnings Per Share (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of basic and diluted common shares outstanding        
Weighted average number of basic common shares outstanding 7,007,000 10,060,000 7,959,000 10,152,000
Assumed exercise of stock options, net of shares assumed repurchased at average market price during the period using proceeds received upon exercise of options 176,180 39,492 109,601 45,034
Weighted average number of diluted common shares outstanding 7,184,000 10,100,000 8,069,000 10,198,000