Stockholders' Equity (Schedule Of Computation Of Basic And Diluted Earnings Per Share) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
Weighted average shares outstanding for basic earnings per share (in shares)	25,235,000	25,060,000	25,208,000	24,993,000
Common stock equivalents pertaining to stock options and deferred stock units (in shares)	269,000	399,000	301,000	339,000
Weighted average shares outstanding for diluted earnings per share (in shares)	25,504,000	25,459,000	25,509,000	25,332,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	114,000	64,000	106,000	117,000