Loss Per Share (Computation Of Basic And Diluted (Loss) Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic loss per common share
Net loss	$ (3,138)	$ (6,665)
Net loss allocated to participating securities	23	43
Net loss allocated to common shareholders	$ (3,115)	$ (6,622)
Basic weighted-average common shares outstanding	38,738	37,390
Basic loss per common share	$ (0.08)	$ (0.18)
Diluted loss per common share
Net loss	$ (3,138)	$ (6,665)
Net loss allocated to participating securities	23	43
Net loss allocated to common shareholders	$ (3,115)	$ (6,622)
Basic weighted-average common shares outstanding	38,738	37,390
Diluted weighted-average common shares outstanding	38,738	37,390
Diluted loss per common share	$ (0.08)	$ (0.18)