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Income Taxes (Reconciliation Of The Statutory Federal Income Tax With The Company's Effective Tax Rate) (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
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory rate |  |  |  |  |  |  |  |  | $ 125,485 | $ 112,215 | $ 94,338
State income taxes, net of federal income tax |  |  |  |  |  |  |  |  | 28,333 | 30,762 | 6,721
Change in uncertain tax position |  |  |  |  |  |  |  |  | 2,661 | (617) | 1,544
Foreign tax rate difference |  |  |  |  |  |  |  |  | (629) | (318) | (412)
Excess tax benefit from stock-based compensation |  |  |  |  |  |  |  |  | (9,670) | (3,700) | (57,431)
Revaluation of deferred tax assets |  |  |  |  |  |  |  |  |  | (3,006) | 42,443
Other, net |  |  |  |  |  |  |  |  | 2,972 | 5,058 | (538)
Provision for income taxes | $ 31,925 | $ 40,632 | $ 38,225 | $ 38,370 | $ 41,869 | $ 36,672 | $ 31,060 | $ 30,793 | $ 149,152 | $ 140,394 | $ 86,665

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- Definition Tax cuts and jobs acts of 2017 change in tax rate revaluation of deferred tax assets and liabilities. + References No definition available. + Details
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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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