Stock Compensation (Summary Of Stock Options Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 years months days
Stock Compensation [Abstract]
Number of Options, Outstanding at beginning of period	577,816
Number of Options, Granted	14,000
Number of Options, Exercised	(24,600)
Number of Options, Outstanding at end of period	567,216
Number of Options, Exercisable at end of period	307,216
Weighted Average Exercise Price, Outstanding at beginning of period	$ 48.95
Weighted Average Exercise Price, Granted	$ 60.66
Weighted Average Exercise Price, Exercised	$ 42.67
Weighted Average Exercise Price, Outstanding at end of period	$ 49.51
Weighted Average Exercise Price, Exercisable at end of period	$ 46.70
Weighted Average Remaining Contract Life, Outstanding, in years	5.93
Weighted Average Remaining Contract Life, Exercisable, in years	3.98
Aggregate Intrinsic Value, Outstanding	$ 1,960
Aggregate Intrinsic Value, Exercisable	$ 1,821