Stock Option And Stock Award Plans (Summary Of Additional Information On Non-Vested Restricted Stock Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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, Vested	$ (700)	$ (1,700)	$ (2,100)
Restricted Stock
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	157,850	143,900	126,150
Number of Shares, Granted	95,707	93,425	94,949
Number of Shares, Vested	(54,921)	(58,175)	(60,357)
Number of Shares, Forfeited	(10,578)	(21,300)	(16,842)
Number of Shares, Outstanding, Ending Balance	188,058	157,850	143,900
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance	$ 22.00	$ 18.82	$ 18.25
Wgtd. Ave. Grant Date Fair Value/Sh., Granted	$ 22.18	$ 25.45	$ 19.06
Wgtd. Ave. Grant Date Fair Value/Sh., Vested	$ 20.73	$ 20.15	$ 18.01
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited	$ 21.76	$ 20.70	$ 18.82
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance	$ 22.48	$ 22.00	$ 18.82
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	3,473	2,708	2,302
Grant Date Fair Value, Granted	2,123	2,378	1,810
Grant Date Fair Value, Vested	(1,139)	(1,172)	(1,087)
Grant Date Fair Value, Forfeited	(230)	(441)	(317)
Grant Date Fair Value, Outstanding, Ending Balance	4,227	3,473	2,708
Maximum Non-Vested Restricted Stock Units Issuable Upon Satisfaction Of Certain Performance Criteria
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	132,300	91,800	85,000
Number of Shares, Granted	59,675	77,200	87,200
Number of Shares, Vested	0	0	0
Number of Shares, Forfeited	(62,262)	(36,700)	(80,400)
Number of Shares, Outstanding, Ending Balance	129,713	132,300	91,800
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance	$ 23.81	$ 18.85	$ 19.35
Wgtd. Ave. Grant Date Fair Value/Sh., Granted	$ 21.54	$ 27.82	$ 18.79
Wgtd. Ave. Grant Date Fair Value/Sh., Vested	$ 0.00	$ 0.00	$ 0.00
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited	$ 19.18	$ 19.83	$ 19.31
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance	$ 24.99	$ 23.81	$ 18.85
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	3,150	1,730	1,645
Grant Date Fair Value, Granted	1,285	2,148	1,638
Grant Date Fair Value, Vested	0	0	0
Grant Date Fair Value, Forfeited	(1,194)	(728)	(1,553)
Grant Date Fair Value, Outstanding, Ending Balance	$ 3,241	$ 3,150	$ 1,730