Stockholders' Equity (Schedule Of Computation Of Basic And Diluted Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stockholders' Equity Note [Abstract]
Weighted average shares outstanding for basic earnings per share (in shares)	25,162	25,031	25,125	24,984
Common stock equivalents pertaining to stock options and deferred stock units (in shares)	151	125	95	69
Weighted average shares outstanding for diluted earnings per share (in shares)	25,313	25,156	25,220	25,053
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	119	123	113	122