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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, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (7,011)	$ 6,626
Weighted average common shares outstanding - Basic	1,890	1,887
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	0	9
Weighted average common shares outstanding - Diluted	1,890	1,896
Basic (Loss) Earnings per Common Share	$ (3.71)	$ 3.51
Diluted (Loss) Earnings per Common Share	$ (3.71)	$ 3.49

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