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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at statutory rate |  |  |  |  |  |  |  |  | $ 29,117 | $ 28,564 | $ 45,740
Re-measurement of net deferred tax asset due to enactment of new tax legislation |  |  |  |  |  |  |  |  | 0 | 0 | 1,365
Excess tax benefits related to stock-based awards |  |  |  |  |  |  |  |  | (449) | (946) | (860)
Valuation allowance |  |  |  |  |  |  |  |  | 49 | 0 | 4
Other |  |  |  |  |  |  |  |  | 388 | 324 | 120
Income tax expense | $ 8,743 | $ 4,629 | $ 9,111 | $ 6,622 | $ 6,193 | $ 7,979 | $ 7,332 | $ 6,438 | $ 29,105 | $ 27,942 | $ 46,369
Statutory tax rate (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%

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- Definition Amount 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 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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