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Income Taxes - Difference of Income Taxes from Statutory Federal Income Tax Rates (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal U.S. income tax rate | 21.00% | 21.00% | 35.00%
State income taxes, net of federal tax benefit | 4.90% | 4.70% | 3.70%
Permanent book/tax differences | 1.10% | 0.60% | 0.40%
Non-U.S. income taxed at different rates, net of foreign tax credits | 2.10% | 2.00% | 0.00%
Federal tax credits | (1.40%) | (1.70%) | (1.30%)
Tax impact of uncertain tax positions | 0.20% | 0.80% | 0.20%
Tax effects of TCJA | 0.00% | 0.40% | 6.50%
Other, net | (0.50%) | (1.20%) | (0.60%)
Effective tax rate | 27.40% | 26.60% | 43.90%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 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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