Income Taxes (Reconciliation Of Effective Tax Rate, By Percentage) (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Tax at U.S. statutory rate	21.00%	21.00%
State income taxes, net of federal benefit	26.20%	(0.40%)
Foreign income taxes, net of foreign tax credits	98.90%	(6.20%)
Other nondeductible items	(2.10%)	(0.60%)
Effect of increase in uncertain tax positions	17.20%	(0.40%)
Change in valuation allowance	(181.70%)	(20.60%)
Expense of prior year tax receivable		(5.50%)
Other	14.00%	3.80%
Effective tax rate	(6.50%)	(8.90%)

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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