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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2016
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 35% to income before income taxes for the three months ended June 30, 2016 and 2015 due to the following (in thousands):
|  | 2016 |  | 2015
Computed “expected” tax expense |  | $ | 56,822 |  |  | 35.0 | % |  | $ | 50,852 |  |  | 35.0 | %
Changes resulting from: |  |  |  |  |  |  |  |
Foreign income tax differential |  | (4,424 | ) |  | (2.7 | )% |  | (5,747 | ) |  | (4.0 | )%
State taxes net of federal benefits |  | 1,909 |  |  | 1.2 | % |  | 2,022 |  |  | 1.4 | %
Foreign-sourced nontaxable income |  | (2,020 | ) |  | (1.2 | )% |  | (4,061 | ) |  | (2.8 | )%
Other |  | (4,124 | ) |  | (2.6 | )% |  | 3,547 |  |  | 2.5 | %
Provision for income taxes |  | $ | 48,163 |  |  | 29.7 | % |  | $ | 46,613 |  |  | 32.1 | %

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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=6907707&loc=d3e32687-109319 + Details
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