Stockholders' Equity (Schedule Of Computation Of Basic And Diluted Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Weighted average shares outstanding for basic earnings per share (in shares)	25,233	24,992	25,195	24,959
Common stock equivalents pertaining to stock options and deferred stock units (in shares)	221	313	332	337
Weighted average shares outstanding for diluted earnings per share (in shares)	25,454	25,305	25,527	25,296