Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Results [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	Year Ended December 31, 2013
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter
Revenues	$	138,035	$	127,788	$	141,361	$	113,617
Gross profit		115,857		105,987		118,682		93,382
Net income attributable to j2 Global, Inc. common shareholders		20,754		27,806		36,040		22,922
Net income per common share:
Basic	$	0.45	$	0.60	$	0.78	$	0.50
Diluted	$	0.44	$	0.59	$	0.77	$	0.49
Weighted average shares outstanding
Basic		45,867,769		45,729,171		45,428,230		45,160,140
Diluted		46,382,363		46,291,631		46,018,245		45,668,167
	Year Ended December 31, 2012
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter
Revenues	$	102,033	$	93,246	$	89,465	$	86,652
Gross profit		83,375		76,943		73,278		70,788
Net income attributable to j2 Global, Inc. common shareholders		30,203		31,650		31,188		28,539
Net income per common share:
Basic	$	0.66	$	0.69	$	0.68	$	0.61
Diluted	$	0.65	$	0.69	$	0.67	$	0.60
Weighted average shares outstanding
Basic		45,071,204		45,002,565		45,373,930		46,400,441
Diluted		45,423,502		45,340,111		45,569,564		46,794,603