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Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Summary of Provision for Income Taxes and U.S. Federal Tax Rate | The provision for income taxes differs from amounts computed by applying the U.S. federal tax rate of 21% for 2018 and 35% for 2017 to income before income taxes for the three months ended March 31, 2018 and 2017 due to the following (in thousands):
|  | 2018 |  | 2017
Computed tax expense at the U.S. federal tax rate |  | $ | 48,157 |  |  | 21.0 | % |  | $ | 58,579 |  |  | 35.0 | %
Changes resulting from: |  |  |  |  |  |  |  |
Foreign income tax differential |  | 2,016 |  |  | 0.9 | % |  | (5,843 | ) |  | (3.5 | )%
Excess tax benefits related to stock-based compensation |  | (4,624 | ) |  | (2.0 | )% |  | (8,721 | ) |  | (5.2 | )%
State taxes net of federal benefits |  | 3,373 |  |  | 1.5 | % |  | 1,607 |  |  | 1.0 | %
Foreign-sourced nontaxable income |  | (6,588 | ) |  | (2.9 | )% |  | (3,372 | ) |  | (2.0 | )%
Foreign withholding taxes |  | 5,471 |  |  | 2.4 | % |  | 2,045 |  |  | 1.2 | %
GILTI Tax, net of foreign tax credits |  | 4,921 |  |  | 2.1 | % |  | — |  |  | — | %
Other |  | 1,656 |  |  | 0.7 | % |  | (620 | ) |  | (0.4 | )%
Provision for income taxes |  | $ | 54,382 |  |  | 23.7 | % |  | $ | 43,675 |  |  | 26.1 | %

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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://www.xbrl.org/2003/role/presentationRef -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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