Marketable Securities and Certificates of Deposit (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Unrealized Gain (Loss) on Investments

The amortized cost and estimated fair value of the Company's Marketable Securities as of September 30, 2017 and December 31, 2016 were as follows:

	September 30, 2017								December 31, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Securities Investments	$	7,098	$	6	$	4,069	$	3,035	$	6,470	$	—	$	3,945	$	2,525
Debt Securities Carried by EGL	22,806		87		1		22,892		38,392		77		15		38,454
Investment Funds	22,307		4,167		66		26,408		23,665		1,854		11		25,508
Total	$	52,211	$	4,260	$	4,136	$	52,335	$	68,527	$	1,931	$	3,971	$	66,487

Investments Classified by Contractual Maturity Date

Scheduled maturities of the Company's available-for-sale debt securities within the Securities Investments portfolio as of September 30, 2017 and December 31, 2016 were as follows:

	September 30, 2017				December 31, 2016
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	101	$	101	$	—	$	—
Due after one year through five years	1,609		1,613		1,748		1,728
Total	$	1,710	$	1,714	$	1,748	$	1,728