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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |
Tax provision at statutory rate based on income before income taxes (percent) | 21.00% | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation Tax Reform, Domestic | 0.00% | 0.00% | 1.80% |
Effective Income Tax Rate Reconciliation Tax Reform, International | 0.00% | 0.00% | (3.60%) |
Foreign income taxes (percent) | 129.60% | 6.40% | 3.60% |
Federal research credit (percent) | (124.20%) | (4.00%) | (2.80%) |
Effective Income Tax Rate Reconciliation, Tax treaty protocols, Percent | 0.00% | (2.90%) | 0.00% |
Settlement of taxing authority examinations (percent) | (122.90%) | (7.70%) | (0.70%) |
Stock-based compensation (percent) | (267.70%) | (15.40%) | (1.60%) |
Non deductible/non-taxable items (percent) | 28.60% | 2.80% | (1.40%) |
State income taxes, net of federal tax benefit (percent) | (24.50%) | 0.30% | 1.60% |
Effective Income Tax Rate Reconciliation, US tax on worldwide earnings at different rates, Percent | (123.70%) | 7.90% | 2.90% |
Other, net (percent) | (10.10%) | (0.10%) | (1.50%) |
Effective income tax rate, continuing operations (percent) | (493.90%) | 8.30% | 19.30% |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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