Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation From time to time, J2 Global and its affiliates are involved in litigation and other legal disputes or regulatory inquiries that arise in the ordinary course of business. Any claims or regulatory actions against J2 Global and its affiliates, whether meritorious or not, could be time consuming and costly, and could divert significant operational resources. The outcomes of such matters are subject to inherent uncertainties, carrying the potential for unfavorable rulings that could include monetary damages and injunctive relief. On February 17, 2011, Emmanuel Pantelakis (“Pantelakis”) filed suit against a J2 Global affiliate in the Ontario Superior Court of Justice (No. 11-50673), alleging that the J2 Global affiliate breached a contract relating to Pantelakis’s use of the Campaigner service. The J2 Global affiliate filed a responsive pleading on March 23, 2011 and responses to undertakings on July 16, 2012. On November 6, 2012, Pantelakis filed a second amended statement of claim, reframing his lawsuit as a negligence action. The J2 Global affiliate filed an amended statement of defense on April 8, 2013. Discovery has closed, with the exception of one issue. There is an anticipated trial date of September 2021. On January 21, 2016, Davis Neurology, P.A. filed a putative class action against two J2 Global affiliates in the Circuit Court for the County of Pope, State of Arkansas (58-cv-2016-40), alleging violations of the TCPA. The case was removed to the U.S. District Court for the Eastern District of Arkansas (No. 4:16-cv-00682). On March 20, 2017, the District Court granted a motion for judgment on the pleadings filed by the J2 Global affiliates and dismissed all claims against the J2 Global affiliates. On July 23, 2018, the Eighth Circuit Court of Appeals vacated the judgment and remanded to district court with instructions to return the case to state court. On January 29, 2019, after further appeals were exhausted, the case was remanded to the Arkansas state court. On April 1, 2019, the state court granted a motion for class certification filed by the plaintiff in 2016. Because the prior removal to federal court had deprived the state court of jurisdiction, the J2 Global affiliates had not yet filed an opposition brief to the 2016 motion when the state court granted the motion. The J2 Global affiliates appealed the order. On July 15, 2019, the J2 Global affiliates removed the case to federal court pursuant to the Class Action Fairness Act of 2005. On November 26, 2019 the court denied the Plaintiff’s motion to remand. On December 20, 2019, the court granted the Plaintiff’s motion for leave to amend its complaint. On May 21, 2020, the court denied J2 Global affiliates’ motion to dismiss. On August 11, 2020, the court approved an opt-in class notice. Notice has not yet been issued and the J2 Global affiliates have moved to decertify the class. On December 2, 2020, the parties provided notice to the Court that they have reached a tentative settlement in the matter, and on February 18, 2021, the parties filed a motion for preliminary approval of the class settlement, certification of a settlement class and for permission to disseminate notice. On July 8, 2020, Jeffrey Garcia filed a putative class action lawsuit against J2 Global in the Central District of California (20-cv-06906), alleging violations of federal securities laws. J2 Global has moved to dismiss the consolidated class action complaint. On September 24, 2020, International Union of Operating Engineers of Eastern Pennsylvania and Delaware filed a lawsuit in the Delaware Court of Chancery (C.A. No. 2020-0819-VCL) asserting derivative claims against directors of J2 Global, Inc. and other third parties. On November 17, 2020, the court entered an order allowing Orlando Police Pension Fund to intervene as a plaintiff in the case. The lawsuit alleges violations of breach of fiduciary duty and usurpation of corporate opportunity. J2 Global and its directors and officers intend to defend against the lawsuit. On December 11, 2020, Danning Huang filed a lawsuit in the District of Delaware (20-cv-01687-LPS) asserting derivative claims against directors of J2 Global, Inc. and other third parties. The lawsuit alleges violations of Section 14(a), Section 10(b), Section 20(a) and Rule 10b-5 of the Securities Exchange Act of 1934, as well as breach of fiduciary duty, unjust enrichment and abuse of control. J2 Global and its directors and officers intend to defend against the lawsuit. J2 Global does not believe, based on current knowledge, that the foregoing legal proceedings or claims, after giving effect to existing accrued liabilities, are likely to have a material adverse effect on the Company’s consolidated financial position, results of operations, or cash flows. However, depending on the amount and timing, an unfavorable resolution of some or all of these matters could have a material effect on J2 Global’s consolidated financial position, results of operations, or cash flows in a particular period. The Company has accrued approximately $4.5 million in connection with potential loss contingencies relating to these legal proceedings because they are considered probable by management. It is the Company’s policy to expense as incurred legal fees related to various litigations. Credit Agreement On January 7, 2019, J2 Cloud Services, LLC entered into a Credit Agreement (the “Credit Agreement”) with certain lenders from time to time party thereto (collectively, the “Lenders”) and MUFG Union Bank, N.A., as sole lead arranger and as administrative agent for the Lenders (the “Agent”). Pursuant to the Credit Agreement, as amended in July and August 2019, the Lenders provided J2 Cloud Services with a credit facility of $200.0 million (the “MUFG Credit Facility”) through December 31, 2020. On November 15, 2019, the Company reduced its borrowing capacity from $200.0 million to $100.0 million. The proceeds of the MUFG Credit Facility were intended to be used for working capital and general corporate purposes of J2 Cloud and its subsidiaries, including to finance certain permitted acquisitions and capital expenditures in accordance with the terms of the Credit Agreement. On October 7, 2020, the Company terminated the Credit Agreement. Non-Income Related Taxes The Company does not collect and remit sales and use, telecommunication, or similar taxes in certain jurisdictions where the Company believes that such taxes are not applicable or legally required. Several states and other taxing jurisdictions have presented or threatened the Company with assessments, alleging that the Company is required to collect and remit such taxes there. The Company is currently under audit or is subject to audit for indirect taxes in various states, municipalities and foreign jurisdictions. The Company has a $22.5 million reserve established for these matters which is included in other long-term liabilities and accounts payable and accrued expenses on the Consolidated Balance Sheet at December 31, 2020. It is reasonably possible that additional liabilities could be incurred resulting in additional expense, which could materially impact our financial results.