Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	21.00%	21.00%
State taxes	(0.50%)	1.10%	(2.80%)
Other nondeductible items	0.00%	(0.70%)	(0.50%)
Nondeductible interest and derivatives	(9.70%)	(1.50%)	(4.00%)
Foreign rate differences	(1.80%)	(1.80%)	(2.20%)
Change in valuation allowance	5.90%	(5.30%)	(5.40%)
Stock compensation	(5.50%)	(1.20%)	(5.60%)
Executive compensation	(0.10%)	(0.10%)	(0.30%)
Goodwill impairment	0.00%	(10.70%)	0.00%
Subscription receivable	0.00%	0.00%	(1.20%)
US tax impact of restructuring	(0.144)	0	0
Other adjustments	1.10%	(0.50%)	(1.00%)
Uncertain tax positions	2.10%	0.00%	(0.40%)
Effective tax rate	(1.90%)	0.30%	(2.40%)

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Interest And Derivatives, Percent

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Effective income tax rate reconciliation, stock compensation shortfalls

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Effective Income Tax Rate Reconciliation, Subscription Receivable, Percent

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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