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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Schedule Of Interest And Penalties |
| September 30, 2021 |  | December 31, 2020
Gross liability for unrecognized tax benefits, exclusive of interest and penalties | $ | 16,721 |  |  | $ | 15,911 |
Interest and penalties on unrecognized benefits | 1,835 |  |  | 2,105 |
Total gross uncertain tax positions | $ | 18,556 |  |  | $ | 18,016 |
Amount included in Current liabilities | $ | 4,497 |  |  | $ | 6,546 |
Amount included in Other long-term liabilities | 14,059 |  |  | 11,470 |
| $ | 18,556 |  |  | $ | 18,016 |
Schedule of Effective Income Tax Rate Reconciliation | The effective income tax rate for the three and nine months ended September 30, 2021 and 2020 differs from the federal income tax statutory rate due to the following:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State taxes, net of federal tax benefit |  | 2.5 |  |  | 3.3 |  |  | 3.0 |  |  | 3.2 |
Foreign tax expense and tax rate differential |  | (0.1) |  |  | (0.2) |  |  | (0.1) |  |  | (0.1) |
Tax benefit from stock option exercises |  | (0.6) |  |  | (0.4) |  |  | (1.0) |  |  | (1.0) |
Expiration of the statute of limitations |  | — |  |  | (1.3) |  |  | — |  |  | (0.5) |
State settlements |  | (0.3) |  |  | — |  |  | (0.2) |  |  | — |
Provision-to-return adjustment |  | (0.5) |  |  | (0.4) |  |  | (0.2) |  |  | (0.1) |
Other, net |  | (0.3) |  |  | (0.6) |  |  | (0.3) |  |  | (0.5) |
|  | 21.7 | % |  | 21.4 | % |  | 22.2 | % |  | 22.0 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: 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=121826272&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32840-109319 + Details
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