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Stock Option And Stock Award Plans (Summary Of Additional Information On Non-Vested Restricted Stock Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of Shares, Outstanding, Beginning Balance 206,676 207,355 132,353
Number of Shares, Granted 119,915 107,362 144,546
Number of Shares, Vested (64,702) (50,154) (52,167)
Number of Shares, Forfeited (17,153) (57,887) (17,377)
Number of Shares, Outstanding, Ending Balance 244,736 206,676 207,355
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance $ 16.15 $ 15.90 $ 21.19
Wgtd. Ave. Grant Date Fair Value/Sh., Granted 17.39 18.29 13.47
Wgtd. Ave. Grant Date Fair Value/Sh., Vested 18.31 19.72 21.56
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited 15.84 16.16 18.97
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance $ 16.20 $ 16.15 $ 15.90
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Grant Date Fair Value, Outstanding, Beginning Balance $ 3,337 $ 3,297 $ 2,805
Grant Date Fair Value, Granted 2,085 1,964 1,947
Grant Date Fair Value, Vested (1,185) (989) (1,125)
Grant Date Fair Value, Forfeited (272) (935) (330)
Grant Date Fair Value, Outstanding, Ending Balance $ 3,965 $ 3,337 $ 3,297
Maximum Non Vested Restricted Stock Units Issuable Upon Satisfaction Of Certain Performance Criteria [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of Shares, Outstanding, Beginning Balance 172,133 238,429 167,128
Number of Shares, Granted 61,227 46,205 136,986
Number of Shares, Vested 0 0 0
Number of Shares, Forfeited (48,651) (112,501) (65,685)
Number of Shares, Outstanding, Ending Balance 184,709 172,133 238,429
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance $ 15.78 $ 16.39 $ 22.04
Wgtd. Ave. Grant Date Fair Value/Sh., Granted 17.35 17.38 11.34
Wgtd. Ave. Grant Date Fair Value/Sh., Vested 0.00 0.00 0.00
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited 13.23 17.73 20.24
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance $ 16.97 $ 15.78 $ 16.39
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Grant Date Fair Value, Outstanding, Beginning Balance $ 2,716 $ 3,908 $ 3,684
Grant Date Fair Value, Granted 1,062 803 1,553
Grant Date Fair Value, Vested 0 0 0
Grant Date Fair Value, Forfeited (644) (1,995) (1,329)
Grant Date Fair Value, Outstanding, Ending Balance $ 3,134 $ 2,716 $ 3,908