Stockholders' Deficit Stockholders' (Deficit) Equity (Changes In Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Foreign Currency Translation Adjustmentss Loss, Changes	$ 0	$ 0
Foreign Currency Translation Adjustment, Balance	(2,836)	(2,836)	$ (2,836)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(135)	190
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax	80	215	25
Other Comprehensive Income (Loss), Net of Tax	(135)	190	130
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (2,756)	$ (2,621)	$ (2,811)