Income (Loss) Per Common Share (Computation Of Basic And Diluted Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic income (loss) per common share
Net income (loss)	$ 226	$ 3,163	$ (3,629)	$ 5,386
Net (income) loss allocated to participating securities	(2)	(62)	31	(106)
Net income (loss) allocated to common shareholders	$ 224	$ 3,101	$ (3,598)	$ 5,280
Basic weighted-average common shares outstanding	36,318	32,664	36,233	32,552
Basic income (loss) per common share	$ 0.01	$ 0.09	$ (0.10)	$ 0.16
Diluted income (loss) per common share
Net income (loss)	$ 226	$ 3,163	$ (3,629)	$ 5,386
Net (income) loss allocated to participating securities	(2)	(60)	31	(103)
Net income (loss) allocated to common shareholders	$ 224	$ 3,103	$ (3,598)	$ 5,283
Basic weighted-average common shares outstanding	36,318	32,664	36,233	32,552
Effect of dilutive stock options and awards	931	1,150		1,187
Diluted weighted-average common shares outstanding	37,249	33,814	36,233	33,739
Diluted income (loss) per common share	$ 0.01	$ 0.09	$ (0.10)	$ 0.16