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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Summary of average number of shares used in the computation of basic and diluted earnings per share

 
Three Months Ended 
 March 31, 
(shares in thousands) 2015  2014 
Basic earnings per share  4,879   4,871 
Diluted earnings per share  6,379   4,894