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Taxes | 6 Months Ended
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Jun. 30, 2019
Income Tax Disclosure [Abstract] |
Taxes | Taxes A reconciliation of the United States federal statutory corporate tax rate to the Company’s income tax expense, or effective tax rate, was as follows:
| Three-months Ended |  | Six-months Ended
| June 30, 2019 |  | July 1, 2018 |  | June 30, 2019 |  | July 1, 2018
Income tax expense at U.S. federal statutory corporate tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | %
State income taxes, net of federal benefit | 1 | % |  | 2 | % |  | 1 | % |  | 2 | %
Foreign tax rate differential | (7 | )% |  | (7 | )% |  | (7 | )% |  | (7 | )%
Tax credit | (1 | )% |  | (1 | )% |  | (1 | )% |  | (1 | )%
Discrete tax benefit related to stock options | (2 | )% |  | (1 | )% |  | (4 | )% |  | (5 | )%
Other | 2 | % |  | 2 | % |  | 2 | % |  | 1 | %
Income tax expense | 14 | % |  | 16 | % |  | 12 | % |  | 11 | %
Management has determined that earnings from its legal entity in China will be indefinitely reinvested to provide sufficient local funding for growth, and that earnings from all other jurisdictions will not be indefinitely reinvested. The Company is tax resident in numerous jurisdictions around the world and has identified its major tax jurisdictions as the United States, Ireland, and China. The statutory tax rate is 12.5% in Ireland and 25% in China, compared to the U.S. federal statutory corporate tax rate of 21%. International rights to certain of the Company's intellectual property are held by a subsidiary whose legal jurisdiction does not tax this income, resulting in a foreign effective tax rate that is lower than the above mentioned statutory rates, although the reduced taxes overseas have been partially offset by changes in U.S. tax law. These differences resulted in a decrease in the effective tax rate by 7 percentage points for all periods presented. The excess tax benefit arising from the difference between the deduction for tax purposes and the compensation cost recognized for financial reporting purposes from stock option exercises resulted in a decrease in the effective tax rate by 2 and 1 percentage points for the three-month periods ended June 30, 2019 and July 1, 2018, respectively, and a decrease in the effective tax rate by 4 and 5 percentage points for the six-month periods ended June 30, 2019 and July 1, 2018, respectively. During the six-month period ended June 30, 2019, the Company recorded a $952,000 increase in reserves for income taxes, net of deferred tax benefit. Estimated interest and penalties included in these amounts totaled $155,000 for the six-month period ended June 30, 2019. The Company’s reserve for income taxes, including gross interest and penalties, was $9,119,000 as of June 30, 2019, which included $8,091,000 classified as a non-current liability and $1,028,000 recorded as a reduction to non-current deferred tax assets. The amount of gross interest and penalties included in these balances was $1,019,000. If the Company’s tax positions were sustained or the statutes of limitations related to certain positions expired, these reserves would be released and income tax expense would be reduced in a future period. As a result of the expiration of certain statutes of limitations, there is a potential that a portion of these reserves could be released, which would decrease income tax expense by approximately $1,250,000 to $1,350,000 over the next twelve months. The Company has defined its major tax jurisdictions as the United States, Ireland, and China, and within the United States, Massachusetts. Within the United States, the tax years 2015 through 2018 remain open to examination by the Internal Revenue Service and various state tax authorities. The tax years 2014 through 2018 remain open to examination by various taxing authorities in other jurisdictions in which the Company operates.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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