Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Results [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	Year Ended December 31, 2015
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter
Revenues	$	204,823	$	178,701	$	176,038	$	161,253
Gross profit		170,215		148,032		146,544		133,067
Net income		35,467		37,375		38,916		21,877
Net income attributable to j2 Global, Inc. common shareholders		35,467		37,375		38,916		21,877
Net income per common share:
Basic	$	0.73	$	0.77	$	0.81	$	0.45
Diluted	$	0.72	$	0.77	$	0.80	$	0.45
Weighted average shares outstanding
Basic		47,849,748		47,696,224		47,537,597		47,422,396
Diluted		48,772,061		47,953,871		47,853,574		47,766,088
	Year Ended December 31, 2014
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter
Revenues	$	167,144	$	153,018	$	144,744	$	134,124
Gross profit		138,145		124,974		119,186		110,736
Net income		32,754		28,759		35,049		28,765
Net income attributable to j2 Global, Inc. common shareholders		31,763		28,759		35,049		28,765
Net income per common share:
Basic	$	0.66	$	0.60	$	0.73	$	0.61
Diluted	$	0.66	$	0.60	$	0.73	$	0.60
Weighted average shares outstanding
Basic		47,146,503		46,845,477		46,745,596		46,365,158
Diluted		47,468,841		47,163,912		47,067,767		46,765,732