Condensed Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allocated Share-based Compensation Expense	$ 2,809	$ 3,004
Revenues:
Total revenues	200,502	161,253
Cost of revenues (1)	34,288	28,186
Gross profit	166,214	133,067
Operating expenses:
Sales and marketing (1)	48,112	37,590
Research, development and engineering (1)	8,988	8,447
General and administrative (1)	55,776	46,500
Total operating expenses	112,876	92,537
Income (loss) from operations	53,338	40,530
Interest expense (income), net	10,233	10,313
Other expense (income), net	126	(784)
Income (loss) before income taxes	42,979	31,001
Income Tax Expense (Benefit)	13,036	9,124
Net income attributable to j2 Global, Inc. common shareholders	29,943	21,877
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 29,943	$ 21,877
Net income per common share:
Basic	$ 0.62	$ 0.45
Diluted	$ 0.61	$ 0.45
Weighted average shares outstanding:
Basic	47,966,718	47,422,396
Diluted	48,238,098	47,766,088
Cash dividends paid per common share	$ 0.3250	$ 0.2925
Cost of Sales [Member]
Allocated Share-based Compensation Expense	$ 95	$ 83
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	531	584
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	207	194
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	$ 1,976	$ 2,143