Investments (Tables)

9 Months Ended

Sep. 30, 2015

Investments [Abstract]

Schedule Of Debt Securities By Contractual Maturity Date

The following table summarizes j2 Global’s debt securities designated as available-for-sale, classified by the contractual maturity date of the security (in thousands):

	September 30, 2015		December 31, 2014
Due within 1 year	$	57,084	$	59,896
Due within more than 1 year but less than 5 years	52,577		60,178
Due within more than 5 years but less than 10 years	—		—
Due 10 years or after	312		330
Total	$	109,973	$	120,404

Schedule Of Available-For-Sale And Trading Securities

The following table summarizes the Company’s investments (in thousands):

	September 30, 2015		December 31, 2014
Available-for-sale	$	138,242	$	156,649
Certificates of deposit	57		65
Total	$	138,299	$	156,714

Summary Of Gross Unrealized Gains And Losses And Fair Values

The following table summarizes the gross unrealized gains and losses and fair values for the Company's investments classified as available-for-sale investments as of September 30, 2015 and December 31, 2014 aggregated by major security type (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2015
Corporate debt securities	$	83,036	$	141	$	(56	)	$	83,121
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	23,048		34		(1		)	23,081
Debt securities issued by states of the United States and political subdivisions of the states	3,769		2		—			3,771
Equity securities	20,611		7,658		—			28,269
Total	$	130,464	$	7,835	$	(57	)	$	138,242
December 31, 2014
Corporate debt securities	$	91,456	$	147	$	(136	)	$	91,467
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	26,848		9		(13		)	26,844
Debt securities issued by states of the United States and political subdivisions of the states	2,088		5		—			2,093
Equity securities	20,611		15,634		—			36,245
Total	$	141,003	$	15,795	$	(149	)	$	156,649

Schedule of Unrealized Loss on Investments [Table Text Block]

The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of September 30, 2015 and December 31, 2014, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):

	As of September 30, 2015
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	41,966	$	(55	)	$	1,000	$	(1	)	$	42,966	$	(56	)
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	3,248		(1		)	650		—			3,898		(1		)
Debt securities issued by states of the United States and political subdivisions of the states	880		—			—		—			880		—
Total	$	46,094	$	(56	)	$	1,650	$	(1	)	$	47,744	$	(57	)
	As of December 31, 2014
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	57,898	$	(131	)	$	1,260	$	(5	)	$	59,158	$	(136	)
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	15,072		(13		)	—		—			15,072		(13		)
Total	$	72,970	$	(144	)	$	1,260	$	(5	)	$	74,230	$	(149	)