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Earnings Per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Summary of average number of shares used in the computation of basic and diluted earnings per share        
Basic earnings per share 4,875 4,866 4,873 4,864
Diluted earnings per share 4,893 4,870 4,894 4,870