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Income Taxes (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statutory federal tax rate | 21.00% | 21.00% | 21.00%
Effective income tax rate | 21.00% | 22.20% | 20.10%
U.S Federal authorities [Member] | Minimum [Member] |  |  |
Tax year open for examination | 2017 |  |
U.S Federal authorities [Member] | Maximum [Member] |  |  |
Tax year open for examination | 2019 |  |
State authorities [Member] | Minimum [Member] |  |  |
Tax year open for examination | 2015 |  |
State authorities [Member] | Maximum [Member] |  |  |
Tax year open for examination | 2019 |  |

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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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