Condensed Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Total revenues	$ 113,617	$ 86,652
Cost of revenues (including share-based compensation of $214 and $242 for the three months of 2013 and 2012, respectively)	20,235	15,864
Gross profit	93,382	70,788
Operating expenses:
Sales and marketing (including share-based compensation of $418 and $375 for the three months of 2013 and 2012, respectively)	29,638	14,860
Research, development and engineering (including share-based compensation of $106 and $116 for the three months of 2013 and 2012, respectively)	6,746	4,489
General and administrative (including share-based compensation of $1,610 and $1,560 for the three months of 2013 and 2012, respectively)	24,011	13,829
Total operating expenses	60,395	33,178
Operating income	32,987	37,610
Interest and other income (expense), net	(4,716)	(719)
Income before income taxes	28,271	36,891
Income Tax Expense (Benefit)	5,500	8,352
Net income attributable to j2 Global, Inc. common shareholders	22,922	28,539
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	22,771	28,539
Net Income (Loss) Attributable to Noncontrolling Interest	$ (151)	$ 0
Net income per common share:
Basic	$ 0.50	$ 0.61
Diluted	$ 0.49	$ 0.60
Weighted average shares outstanding:
Basic	45,160,140	46,400,441
Diluted	45,668,167	46,794,603
Cash dividends paid per common share	$ 0.2325	$ 0.21