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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Weighted average shares outstanding for basic earnings per share (in shares)	25,060	24,724	24,993	24,587
Common stock equivalents pertaining to stock options and deferred stock units (in shares)	399	336	339	295
Weighted average shares outstanding for diluted earnings per share (in shares)	25,459	25,060	25,332	24,882