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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax at U.S. federal statutory rates |  |  |  |  |  |  |  |  | $ 21,733 | $ 19,507 | $ 16,766
State taxes (net of federal benefit) |  |  |  |  |  |  |  |  | 5,354 | 4,774 | 3,745
Business meals and entertainment — non-deductible |  |  |  |  |  |  |  |  | 458 | 987 | 915
Change in valuation allowance |  |  |  |  |  |  |  |  | 176 | 932 | 264
Reserves for uncertain tax positions |  |  |  |  |  |  |  |  | (1,290) | (263) | (1,124)
Share-based compensation |  |  |  |  |  |  |  |  | (2,394) | (4,773) | (3,260)
Non-deductible expenses |  |  |  |  |  |  |  |  | 787 | 713 | 785
Other, net |  |  |  |  |  |  |  |  | 317 | (37) | 176
Total income tax expense from continuing operations | $ (1,979) | $ 7,060 | $ 6,607 | $ 13,453 | $ (3,164) | $ 6,069 | $ 5,322 | $ 13,613 | $ 25,141 | $ 21,840 | $ 18,267
Effective income tax rate |  |  |  |  |  |  |  |  | 24.30% | 23.50% | 22.90%

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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