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Taxes (Tables) | 6 Months Ended
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Jun. 30, 2013
Income Tax Disclosure [Abstract] |
Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision | A reconciliation of the United States federal statutory corporate tax rate to the Company’s effective tax rate, or income tax provision, was as follows:
|  | Three-months Ended |  |  | Six-months Ended |
|  | June 30, 2013 |  |  | July 1, 2012 |  |  | June 30, 2013 |  |  | July 1, 2012 |
Income tax at federal statutory rate |  |  | 35 | % |  |  | 35 | % |  |  | 35 | % |  |  | 35 | %
State income taxes, net of federal benefit |  |  | 2 |  |  |  | 1 |  |  |  | 2 |  |  |  | 1 |
Foreign tax rate differential |  |  | (17 | ) |  |  | (15 | ) |  |  | (17 | ) |  |  | (15 | )
2013 research and development credit |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |
Discrete event - 2012 research and development credit |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | — |
Income tax provision |  |  | 19 | % |  |  | 21 | % |  |  | 18 | % |  |  | 21 | %

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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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