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Income Taxes Income Taxes (Table 3) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(0.10%)	(0.70%)	(4.50%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	(3.40%)	(2.10%)	(2.20%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	2.30%	2.40%	2.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense	0.70%	0.10%	0.50%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	2.00%	(4.40%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	0.00%	3.80%	2.70%
Effective Income Tax Rate Reconciliation, Deductions, Other	1.30%	(0.10%)	1.80%

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

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