Loss Per Common 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, 2020	Mar. 31, 2019
Basic income (loss) per common share
Net loss	$ (6,665)	$ (297)
Net loss allocated to participating securities	43	2
Net loss allocated to common shareholders	$ (6,622)	$ (295)
Basic weighted-average common shares outstanding	37,390	36,778
Basic loss per common share	$ (0.18)	$ (0.01)
Diluted loss per common share
Net loss	$ (6,665)	$ (297)
Net loss allocated to participating securities	43	2
Net loss allocated to common shareholders	$ (6,622)	$ (295)
Basic weighted-average common shares outstanding	37,390	36,778
Diluted weighted-average common shares outstanding	37,390	36,778
Diluted loss per common share	$ (0.18)	$ (0.01)