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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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 13,823	$ (7,011)
Weighted average common shares outstanding - Basic	1,894	1,890
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	3	0
Weighted average common shares outstanding - Diluted	1,897	1,890
Basic Earnings (Loss) per Common Share	$ 7.30	$ (3.71)
Diluted Earnings (Loss) per Common Share	$ 7.29	$ (3.71)

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