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Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of the statutory federal income tax rate to the effective tax rate |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 35.00%
Effect of: |  |  |
State and local income taxes | 2.30% | 3.20% | 2.10%
Investment vehicles | (1.30%) | (1.20%) | (1.40%)
Domestic production activities |  |  | (3.10%)
Employee share-based payments | (3.30%) | (3.20%) | (5.90%)
Research and development credits | (1.10%) | (1.30%) | (0.90%)
Amended returns and refunds | 0.10% | (1.60%) | (0.90%)
Tax credit reversal | 3.70% |  |
Other - net | 0.80% | (0.30%) | (0.40%)
Pre-adjusted effective tax rate | 22.20% | 16.60% | 24.50%
Effect of: |  |  |
Tax Act |  | 0.019 | (0.408)
Subsidiary mergers |  |  | (4.20%)
Reported effective tax rate | 22.20% | 18.50% | (20.50%)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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