Investments (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2015		December 31, 2014
Due within 1 year	$	49,378	$	59,896
Due within more than 1 year but less than 5 years	61,386		60,178
Due within more than 5 years but less than 10 years	—		—
Due 10 years or after	332		330
Total	$	111,096	$	120,404

Schedule Of Available-For-Sale And Trading Securities

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

	March 31, 2015		December 31, 2014
Available-for-sale	$	147,417	$	156,649
Certificates of deposit	60		65
Total	$	147,477	$	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 March 31, 2015 and December 31, 2014 aggregated by major security type (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2015
Corporate debt securities	$	80,043	$	164	$	(44	)	$	80,163
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	28,849		21		(4		)	28,866
Debt securities issued by states of the United States and political subdivisions of the states	2,064		3		—			2,067
Equity securities	20,611		15,710		—			36,321
Total	$	131,567	$	15,898	$	(48	)	$	147,417
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 March 31, 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 March 31, 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	$	36,947	$	(41	)	$	1,258	$	(3	)	$	38,205	$	(44	)
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	12,345		(4		)	625		—			12,970		(4		)
Total	$	49,292	$	(45	)	$	1,883	$	(3	)	$	51,175	$	(48	)
	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	)