Investments (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Cost Method Investments [Table Text Block]

The following table summarizes the gross unrealized losses and estimated fair values for the Company’s securities without a readily determinable fair value (in thousands):



	Cost		Impairment		Adjustments			Fair Value
December 31, 2018
Equity securities	$	34,977	$	—	$	(3,678	)	$	31,299
Total	$	34,977	$	—	$	(3,678	)	$	31,299

December 31, 2017
Equity securities	$	34,977	$	—	$	—		$	34,977
Total	$	34,977	$	—	$	—		$	34,977

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The following table summarizes the gross unrealized gains and losses and fair values for investments classified as available-for-sale (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2018
Corporate debt securities	$	23,256	$	21	$	(1,899	)	$	21,378
Total	$	23,256	$	21	$	(1,899	)	$	21,378

December 31, 2017
Corporate debt securities	$	22,745	$	—	$	—		$	22,745
Total	$	22,745	$	—	$	—		$	22,745

Investments Classified by Contractual Maturity Date [Table Text Block]

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



	December 31, 2018		December 31, 2017
Due within 1 year	$	—	$	—
Due within more than 1 year but less than 5 years	21,378		22,745
Due within more than 5 years but less than 10 years	—		—
Due 10 years or after	—		—
Total	$	21,378	$	22,745

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [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 December 31, 2018 and 2017, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):



	As of December 31, 2018
	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	20,846	$	(1,899	)	$	—	$	—	$	20,846	$	(1,899	)
Total	$	20,846	$	(1,899	)	$	—	$	—	$	20,846	$	(1,899	)

	As of December 31, 2017
	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	22,745	$	—		$	—	$	—	$	22,745	$	—
Total	$	22,745	$	—		$	—	$	—	$	22,745	$	—

Equity Method Investments [Table Text Block]

The following table discloses the carrying amount for the Company’s equity method investment (in thousands):



	December 31, 2018		December 31, 2017
Equity securities	$	31,151	$	—
Maximum exposure to loss	$	31,151	$	—