Commitments And Contingencies (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 200,000	$ 200,000
Line of Credit Facility, Covenant Terms		The Credit Agreement contains financial maintenance covenants, including (i) a maximum total leverage ratio as of the last date of any fiscal quarter not to exceed 3.00:1.00 for J2 Cloud and its restricted subsidiaries; (ii) a maximum total leverage ratio as of the last date of any fiscal quarter not to exceed 3.25:1.00 for J2 and its restricted subsidiaries; and (iii) a minimum EBITDA of not less than $50.0 million for any fiscal quarter for J2 Cloud and its restricted subsidiaries. The Credit Agreement also contains restrictive covenants that limit, among other things, J2 Cloud’s and its restricted subsidiaries’ ability to incur additional indebtedness, create, incur or assume liens, consolidate, merge, liquidate or dissolve, pay dividends or make other distributions or other restricted payments, make or hold any investments, enter into certain transactions with affiliates, sell assets other than on terms specified by the Credit Agreement, amend the terms of certain other indebtedness and organizational documents and change their lines of business and fiscal years, in each case, subject to customary exceptions. The Credit Agreement also sets forth customary events of default, including, among other things, the failure to make timely payments under the Credit Facility, the failure to satisfy certain covenants, cross-default and cross-acceleration to other material debt for borrowed money, the occurrence of a change of control and specified events of bankruptcy and insolvency.
Debt Issuance Costs, Line of Credit Arrangements, Gross	400	$ 400
Debt Issuance Costs, Line of Credit Arrangements, Net	400	400
Loss Contingency Accrual	21,600	21,600
Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	128,000	128,000
Interest Expense	$ 1,100	$ 2,300