Long Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 10, 2014	Jul. 26, 2012
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 652,500
Debt Instrument, Unamortized Discount					$ 5,000
Interest Expense	43,600	$ 32,500	$ 22,300
Long-term Debt	601,186	593,350
Long-term Debt, Current Maturities	0	0
Total long-term debt, less current portion	601,186	593,350
Long-term Debt, Fair Value	$ 790,500	711,100
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Jul. 26, 2012
Debt Instrument, Face Amount	$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Debt Instrument, Maturity Date	Aug. 01, 2020
Proceeds from Debt, Net of Issuance Costs	$ 245,000
Debt Instrument, Unamortized Discount	3,300
Unamortized Debt Issuance Expense	$ 900
Debt Instrument, Frequency of Periodic Payment	semi-annually
Debt Instrument, Call Date, Earliest	Aug. 01, 2016
Debt Instrument, Covenant Description	The indenture governing the Senior Notes contain certain restrictive and other covenants applicable to j2 Cloud Services, Inc. and subsidiaries designated as restricted subsidiaries including, but not limited to, limitations on debt and disqualified or preferred stock, restricted payments, liens, sale and leaseback transactions, dividends and other payment restrictions, asset sales and transactions with affiliates.
Long-term Debt	$ 246,750	246,187
Long-term Debt, Fair Value	$ 262,200	262,400
Convertible Debt Securities [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Jun. 10, 2014
Debt Instrument, Face Amount	$ 402,500
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Debt Instrument, Maturity Date	Jun. 15, 2029
Proceeds from Debt, Net of Issuance Costs	$ 391,400
Debt Instrument, Unamortized Discount	$ 48,100			$ 59,000
Debt Instrument, Convertible, Remaining Discount Amortization Period	5 years 6 months
Debt Issuance Cost	$ 11,700
Unamortized Debt Issuance Expense	$ 8,200
Debt Instrument, Frequency of Periodic Payment	semiannually
Debt Instrument, Convertible, Carrying Amount of Equity Component				$ 37,700
Long-term Debt	$ 354,436	347,163
Long-term Debt, Fair Value	$ 528,300	$ 448,700