(Loss) Income Per Common Share (Computation Of Basic And Diluted (Loss) Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic (loss) income per common share
Net (loss) income		$ (16,682)	$ 1,720	$ (2,840)
Net loss (income) allocated to participating securities		111	(12)	27
Net (loss) income allocated to common shareholders		$ (16,571)	$ 1,708	$ (2,813)
Basic weighted-average common shares outstanding		37,861	37,118	36,412
Basic (loss) income per common share		$ (0.44)	$ 0.05	$ (0.08)
Diluted (loss) income per common share
Net (loss) income		$ (16,682)	$ 1,720	$ (2,840)
Net loss (income) allocated to participating securities		111	(12)	27
Net (loss) income allocated to common shareholders		$ (16,571)	$ 1,708	$ (2,813)
Basic weighted-average common shares outstanding		37,861	37,118	36,412
Effect of dilutive stock options and awards	[1]		742
Diluted weighted-average common shares outstanding		37,861	37,860	36,412
Diluted (loss) income per common share		$ (0.44)	$ 0.05	$ (0.08)

[1] We excluded stock options from the calculation of diluted weighted-average common shares outstanding if the per share value, including the sum of (i) the exercise price of the options and (ii) the amount of the compensation cost attributed to future services and not yet recognized, was greater than the average market price of the shares, because the inclusion of these stock options would be antidilutive to (loss) income per common share. For the year ended December 31, 2020 and 2018 all stock options and awards were excluded from the calculation of weighted-average common shares outstanding as these would be antidilutive to the net loss. For the years ended December 31, 2019 stock options to purchase 131,000 shares were excluded from the calculation of diluted weighted-average common shares outstanding.