Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s tax provision for interim periods is determined using an estimate of the Company’s annual effective tax rate adjusted for discrete interim period tax impacts. Each quarter the Company updates its estimated annual effective tax rate and, if the estimate changes, makes a cumulative adjustment. The Company’s effective tax rate was (0.9)% and 27.1% for the three months ended March 31, 2019 and 2018, respectively. Income before income taxes included income from domestic operations of $2.5 million and $(8.7) million for the three months ended March 31, 2019 and 2018, respectively, and income from foreign operations of $30.1 million and $34.6 million for the three months ended March 31, 2019 and 2018, respectively. As of March 31, 2019 and December 31, 2018, the Company had $54.1 million and $59.6 million, respectively, in liabilities for uncertain income tax positions. Accrued interest and penalties related to unrecognized tax benefits are recognized in income tax expense on the Company’s consolidated statement of income. Cash paid for income taxes net of refunds received was $6.7 million and $5.4 million for the three months ended March 31, 2019 and 2018, respectively. Certain taxes are prepaid during the year and, where appropriate, included within prepaid expenses and other current assets on the consolidated balance sheet. The Company’s prepaid taxes were zero and zero at March 31, 2019 and December 31, 2018, respectively. Income Tax Audits: The Company is in various stages of audit by the U.S. Internal Revenue Service (“IRS”) for its 2012 through 2016 tax years. j2 Global is under income tax audit by the California Franchise Tax Board (the “FTB”) for its tax years 2012 and 2013. The FTB, however, has agreed to suspend its audit for 2012 and 2013 pending the outcome of the IRS audit for such tax years. In August 2018, the FTB notified the Company that it will commence an audit of tax years 2015 and 2016. The Company is under income tax audit by the New York State Department of Taxation and Finance (“NYS”) for tax years 2011 through 2014. The Company is currently under audit by the French tax authorities for tax years 2011 to 2016. The Company has accrued a reserve for any potential liability that may arise from this audit. The audit is in the final stages. It is reasonably possible that these audits may conclude in the next 12 months and that the uncertain tax positions the Company has recorded in relation to these tax years may change compared to the liabilities recorded for these periods. If the recorded uncertain tax positions are inadequate to cover the associated tax liabilities, the Company would be required to record additional tax expense in the relevant period, which could be material. If the recorded uncertain tax positions are adequate to cover the associated tax liabilities, the Company would be required to record any excess as a reduction in tax expense in the relevant period, which could be material. However, it is not currently possible to estimate the amount, if any, of such change.

Income Taxes

The Company’s tax provision for interim periods is determined using an estimate of the Company’s annual effective tax rate adjusted for discrete interim period tax impacts. Each quarter the Company updates its estimated annual effective tax rate and, if the estimate changes, makes a cumulative adjustment. The Company’s effective tax rate was (0.9)% and 27.1% for the three months ended March 31, 2019 and 2018, respectively. Income before income taxes included income from domestic operations of $2.5 million and $(8.7) million for the three months ended March 31, 2019 and 2018, respectively, and income from foreign operations of $30.1 million and $34.6 million for the three months ended March 31, 2019 and 2018, respectively.

As of March 31, 2019 and December 31, 2018, the Company had $54.1 million and $59.6 million, respectively, in liabilities for uncertain income tax positions. Accrued interest and penalties related to unrecognized tax benefits are recognized in income tax expense on the Company’s consolidated statement of income.

Cash paid for income taxes net of refunds received was $6.7 million and $5.4 million for the three months ended March 31, 2019 and 2018, respectively.

Certain taxes are prepaid during the year and, where appropriate, included within prepaid expenses and other current assets on the consolidated balance sheet. The Company’s prepaid taxes were zero and zero at March 31, 2019 and December 31, 2018, respectively.

Income Tax Audits:

The Company is in various stages of audit by the U.S. Internal Revenue Service (“IRS”) for its 2012 through 2016 tax years.

j2 Global is under income tax audit by the California Franchise Tax Board (the “FTB”) for its tax years 2012 and 2013. The FTB, however, has agreed to suspend its audit for 2012 and 2013 pending the outcome of the IRS audit for such tax years. In August 2018, the FTB notified the Company that it will commence an audit of tax years 2015 and 2016.

The Company is under income tax audit by the New York State Department of Taxation and Finance (“NYS”) for tax years 2011 through 2014.

The Company is currently under audit by the French tax authorities for tax years 2011 to 2016. The Company has accrued a reserve for any potential liability that may arise from this audit. The audit is in the final stages.

It is reasonably possible that these audits may conclude in the next 12 months and that the uncertain tax positions the Company has recorded in relation to these tax years may change compared to the liabilities recorded for these periods. If the recorded uncertain tax positions are inadequate to cover the associated tax liabilities, the Company would be required to record additional tax expense in the relevant period, which could be material. If the recorded uncertain tax positions are adequate to cover the associated tax liabilities, the Company would be required to record any excess as a reduction in tax expense in the relevant period, which could be material. However, it is not currently possible to estimate the amount, if any, of such change.