Stockholders' Equity (Schedule of Computation of Basic and Diluted Earnings Per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Weighted average shares outstanding for basic earnings per share	25,020	24,631	24,295
Common stock equivalents pertaining to stock options and deferred stock units	355	302	355
Weighted average shares outstanding for diluted earnings per share	25,375	24,933	24,650