Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 6,626	$ 4,176
Weighted average common shares outstanding - Basic	1,887	1,886
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	9	11
Weighted average common shares outstanding - Diluted	1,896	1,897
Basic Earnings per Common Share	$ 3.51	$ 2.21
Diluted Earnings per Common Share	$ 3.49	$ 2.20