Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 5,500	$ 6,947	$ 12,126	$ 11,123
Weighted average common shares outstanding - Basic	1,889	1,887	1,888	1,886
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	7	10	8	10
Weighted average common shares outstanding - Diluted	1,896	1,897	1,896	1,896
Basic Earnings per Common Share	$ 2.91	$ 3.68	$ 6.42	$ 5.90
Diluted Earnings per Common Share	$ 2.90	$ 3.66	$ 6.40	$ 5.87