Marketable Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of marketable investments

Investments in marketable investments at March 31, 2018 and December 31, 2017 consist of the following (in thousands):

	March 31, 2018		December 31, 2017
Corporate debt securities	$	581	$	600
Equity securities		1,132		1,256
Total	$	1,713	$	1,856

Schedule of available-for-sale securities reconciliation

The amortized cost basis amounts, gross unrealized holding gains, gross unrealized holding losses and fair values of available-for-sale debt securities as of March 31, 2018 and December 31, 2017, are as follows (in thousands):

March 31, 2018	Amortized Cost		Gross Unrealized    Gains		Gross Unrealized    Loss		Fair Value
Corporate debt securities	$	581	$	—	$	—	$	581
Total	$	581	$	—	$	—	$	581

December 31, 2017	Amortized Cost		Gross Unrealized    Gains		Gross Unrealized    Loss		Fair Value
Corporate debt securities	$	600	$	—	$	—	$	600
Total	$	600	$	—	$	—	$	600

Schedule of Proceeds from sales, gross unrealized gains and gross unrealized losses for available-for-sale securities

The following table presents the proceeds from sales, gross unrealized gains and gross unrealized losses for available-for-sale securities that were sold during the following periods

(in thousands)	Three Months Ended March 31,
	2018			2017
Proceeds from sale of equity securities	$	—		$	—
Realized gain on sale of equity securities		—			243
Unrealized net loss on equity securities reflected in the Consolidated Statement of Operations		(124	)		—

Schedule of securities in a continuous unrealized loss position aggregated by investment category and length of time

Securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, were as follows (in thousands):

March 31, 2018	Less than Twelve Months				Twelve Months or Greater					Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Equity securities		—		—		41		(72	)		41		(72	)
Total	$	—	$	—	$	41	$	(72	)	$	41	$	(72	)

December 31, 2017	Less than Twelve Months				Twelve Months or Greater					Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Equity securities		—		—		33		(117	)		33		(117	)
Total	$	—	$	—	$	33	$	(117	)	$	33	$	(117	)