Income (Loss) Per Common Share (Computation Of Basic And Diluted Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic (loss) income per common share
Net income (loss)	$ 2,832	$ 226	$ 2,535	$ (3,629)
Net loss allocated to participating securities	(19)	(2)	(18)	31
Net loss allocated to common shareholders	$ 2,813	$ 224	$ 2,517	$ (3,598)
Basic weighted-average common shares outstanding	37,156	36,318	36,968	36,233
Basic loss per common share	$ 0.08	$ 0.01	$ 0.07	$ (0.10)
Diluted (loss) income per common share
Net income (loss)	$ 2,832	$ 226	$ 2,535	$ (3,629)
Net loss allocated to participating securities	(18)	(2)	(18)	31
Net loss allocated to common shareholders	$ 2,814	$ 224	$ 2,517	$ (3,598)
Basic weighted-average common shares outstanding	37,156	36,318	36,968	36,233
Effect of dilutive stock options and awards	682	931	821
Diluted weighted-average common shares outstanding	37,838	37,249	37,789	36,233
Diluted loss per common share	$ 0.07	$ 0.01	$ 0.07	$ (0.10)