Income Taxes (Components Of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ (41)	$ (74)	$ 255
State and local	179	41
Foreign	111	295	150
Current total	249	262	405
Deferred:
Federal	1,133	2,645	16,752
State and local	(156)	326	(374)
Foreign	3,273	(575)	(110)
Deferred total	4,250	2,396	16,268
Change in valuation allowance for deferred income taxes	(13,490)	(3,486)	(21,760)
Deferred Income Tax Expense (Benefit), Net	(9,240)	(1,090)	(5,492)
Income tax benefit	$ (8,991)	$ (828)	$ (5,087)