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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 10,634	$ 5,927	$ 21,757	$ 16,078
Weighted average common shares outstanding - Basic	1,887	1,887	1,886	1,886
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	10	9	10	10
Weighted average common shares outstanding - Diluted	1,897	1,896	1,896	1,896
Basic Earnings per Common Share	$ 5.64	$ 3.14	$ 11.53	$ 8.52
Diluted Earnings per Common Share	$ 5.61	$ 3.13	$ 11.47	$ 8.48

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