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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 19,782	$ 14,495	$ 33,605	$ 7,484
Weighted average common shares outstanding - Basic	1,894	1,892	1,894	1,891
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	5	3	4	4
Weighted average common shares outstanding - Diluted	1,899	1,895	1,898	1,895
Basic Earnings per Common Share	$ 10.44	$ 7.66	$ 17.74	$ 3.96
Diluted Earnings per Common Share	$ 10.42	$ 7.65	$ 17.70	$ 3.95

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