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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, 2015
Dec. 31, 2014
Dec. 31, 2013
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 188,058 157,850 143,900
Number of Shares, Granted 147,666 95,707 93,425
Number of Shares, Vested (174,145) (54,921) (58,175)
Number of Shares, Forfeited (29,226) (10,578) (21,300)
Number of Shares, Outstanding, Ending Balance 132,353 188,058 157,850
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance $ 22.48 $ 22.00 $ 18.82
Wgtd. Ave. Grant Date Fair Value/Sh., Granted 18.87 22.18 25.45
Wgtd. Ave. Grant Date Fair Value/Sh., Vested 20.57 20.73 20.15
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited 21.42 21.76 20.70
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance $ 21.19 $ 22.48 $ 22.00
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 $ 4,227 $ 3,473 $ 2,708
Grant Date Fair Value, Granted 2,786 2,123 2,378
Grant Date Fair Value, Vested (3,582) (1,139) (1,172)
Grant Date Fair Value, Forfeited (626) (230) (441)
Grant Date Fair Value, Outstanding, Ending Balance $ 2,805 $ 4,227 $ 3,473
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 129,713 132,300 91,800
Number of Shares, Granted 144,582 59,675 77,200
Number of Shares, Vested 0 0 0
Number of Shares, Forfeited (107,167) (62,262) (36,700)
Number of Shares, Outstanding, Ending Balance 167,128 129,713 132,300
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance $ 24.99 $ 23.81 $ 18.85
Wgtd. Ave. Grant Date Fair Value/Sh., Granted 18.47 21.54 27.82
Wgtd. Ave. Grant Date Fair Value/Sh., Vested 0.00 0.00 0.00
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited 20.78 19.18 19.83
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance $ 22.04 $ 24.99 $ 23.81
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 $ 3,241 $ 3,150 $ 1,730
Grant Date Fair Value, Granted 2,670 1,285 2,148
Grant Date Fair Value, Vested 0 0 0
Grant Date Fair Value, Forfeited (2,227) (1,194) (728)
Grant Date Fair Value, Outstanding, Ending Balance $ 3,684 $ 3,241 $ 3,150