Stockholders' Equity (Schedule of Computation of Basic and Diluted Earnings Per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Weighted average shares outstanding for basic earnings per share	25,134	24,998	25,178
Common stock equivalents pertaining to stock options and deferred stock units	121	95	285
Weighted average shares outstanding for diluted earnings per share	25,255	25,093	25,463