Significant Accounting Policies (Schedule Of Weighted Average Shares Outstanding) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Abstract]
Weighted average common shares, basic	25,068	24,435	24,395
Dilutive effect of stock options	491	233	40
Weighted average common shares, diluted	25,559	24,668	24,435