Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 7,952	$ 10,634	$ 20,078	$ 21,757
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)	6	10	8	10
Weighted average common shares outstanding - Diluted	1,895	1,897	1,896	1,896
Basic Earnings per Common Share	$ 4.21	$ 5.64	$ 10.63	$ 11.53
Diluted Earnings per Common Share	$ 4.20	$ 5.61	$ 10.59	$ 11.47