Income Taxes (Summary of Income Tax Benefit (Provision)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S. Federal	$ (1,299)	$ (2,918)
State and local	25	2
Foreign	(250)	(250)
Total current	(1,524)	(3,166)
Deferred:
U.S. Federal	(11,334)	(2,990)
State and local	(28)	3
Total deferred	(11,362)	(2,987)
Income tax benefit (provision)	$ (12,886)	$ (6,153)