Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current Federal income tax expense (benefit)									$ (29)	$ 51	$ 40
Current Foreign income tax expense (benefit)									26	17	52
Current State and local income tax expense (benefit)
Current income tax expense (benefit)									(3)	68	92
Deferred Federal income tax expense (benefit)									(722)	(1,499)	215
Deferred Foreign income tax expense (benefit)
Deferred State and local income tax expense (benefit)									(116)	220	115
Deferred income tax expense (benefit)									(838)	(1,279)	330
Income tax expense (benefit)	$ 418	$ (595)	$ (636)	$ (28)	$ (1,359)	$ 141	$ 2	$ 5	$ (841)	$ (1,211)	$ 422