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Domestic And Foreign Income Taxes (Schedule Of Reconciliation Of The Statutory Federal Income Tax Rate To The Effective Tax Rate Based On Income (Loss)) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
[1]
Domestic And Foreign Income Taxes [Abstract]      
Tax provision at statutory rate 21.00% 21.00% 21.00%
Change in valuation allowance (27.60%) (23.60%) 43.40%
Impact of permanent items, including stock based compensation expense and impairment loss 11.00% (0.30%) (52.70%)
Effect of foreign tax rates (0.80%) 0.30% 0.50%
State taxes net of federal benefit (3.90%) (1.00%) 0.10%
Prior year provision to return true-up (3.20%) (5.80%) (5.60%)
Non-controlling interest 1.00% (0.70%) 0.20%
Other (0.00%) (0.80%) (0.20%)
Domestic and foreign income tax rate (2.50%) (10.80%) 6.70%
[1] Historical effective tax rates have been adjusted due to discontinued operations. Please refer to Note 4 for further information.