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Income Per Common Share (Computation Of Basic And Diluted Income Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 1,325 $ 2,993 $ 6,711 $ 7,881
Net income allocated to participating securities (22) (58) (126) (152)
Net income allocated to common shareholders $ 1,303 $ 2,935 $ 6,585 $ 7,729
Basic weighted-average common shares outstanding 32,887 32,151 32,665 31,731
Basic income per common share $ 0.04 $ 0.09 $ 0.20 $ 0.24
Net income allocated to participating securities, diluted $ (22) $ (56) $ (122) $ (148)
Net income allocated to common shareholders, diluted $ 1,303 $ 2,937 $ 6,589 $ 7,733
Effect of dilutive stock options and awards [1] 1,170 1,014 1,186 837
Diluted weighted-average common shares outstanding 34,057 33,165 33,851 32,568
Diluted income per common share $ 0.04 $ 0.09 $ 0.19 $ 0.24
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 264 1 215 810
[1] We excluded stock options from the calculation of diluted weighted-average common shares outstanding if the per share value, including the sum of (i) the exercise price of the options and (ii) the amount of the compensation cost attributed to future services and not yet recognized, was greater than the average market price of the shares because the inclusion of these stock options would be antidilutive to income per common share. Accordingly, stock options to purchase a weighted-average 264,000 and 215,000 shares for the three and nine months ended September 30, 2017, respectively, and 1,000 and 810,000 shares for the three and nine months ended September 30, 2016, respectively, were excluded from the calculation of diluted weighted-average common shares outstanding.