Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 6,185	$ 13,823
Weighted average common shares outstanding - Basic	1,896	1,894
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	7	3
Weighted average common shares outstanding - Diluted	1,903	1,897
Basic Earnings per Common Share	$ 3.26	$ 7.30
Diluted Earnings per Common Share	$ 3.25	$ 7.29