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Income Taxes | 6 Months Ended
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Jun. 30, 2017
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Statutory rate | 35.0 | % |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State taxes | 0.8 |  |  | 1.0 |  |  | 0.4 |  |  | 1.0 |
Taxes on foreign earnings | (11.7 | ) |  | (10.0 | ) |  | (11.4 | ) |  | (9.0 | )
Credits and net operating loss utilization | (0.9 | ) |  | (1.2 | ) |  | (0.8 | ) |  | (1.2 | )
Purchased intangible assets | 1.4 |  |  | 1.1 |  |  | 1.4 |  |  | 1.1 |
Manufacturing deduction | (2.1 | ) |  | (1.6 | ) |  | (2.1 | ) |  | (1.7 | )
Other permanent items | 0.7 |  |  | 0.6 |  |  | 0.7 |  |  | 0.6 |
Other | 0.6 |  |  | 0.3 |  |  | 0.8 |  |  | 0.2 |
Effective tax rate | 23.8 | % |  | 25.2 | % |  | 24.0 | % |  | 26.0 | %
For the three and six months ended June 30, 2017, compared to the same periods in 2016, the decrease in our effective tax rate was primarily due to a lower relative percentage of our earnings being recognized in the U.S., a high tax jurisdiction, along with a higher deduction for U.S. manufacturing activities. The geographic split of our earnings was affected by milestone and upfront payments in the current year, the spin-off of our hemophilia business and offsetting growth in sales of SPINRAZA in the U.S. For the six months ended June 30, 2017, we also recognized a benefit from a favorable settlement of a state tax matter. Accounting for Uncertainty in Income Taxes We and our subsidiaries are routinely examined by various taxing authorities. We file income tax returns in various U.S. states and in U.S. federal and other foreign jurisdictions. With few exceptions, we are no longer subject to U.S. federal tax examination for years before 2013 or state, local or non-U.S. income tax examinations for years before 2005. We made payments totaling approximately $57.0 million to the Danish Tax Authority (SKAT) for assessments received for fiscal 2009, 2011 and 2013 regarding withholding taxes and the treatment of certain intercompany transactions involving a Danish affiliate and another of our affiliates. We continue to dispute the assessments for all of these periods and believe that the positions taken in our historical filings are valid.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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