Net Loss Per Common Share (Narrative) (Details) - Stock Compensation Plan [Member] - $ / shares	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	748,775	757,775
Weighted average price of anti-dilutive options outstanding	$ 19.01	$ 21.78
Exercise of stock options excluded	28,398	30,553

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Number of share options (or share units) exercised during the current period.

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Weighted average price of anti-dilutive stock options outstanding.

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