Marketable Securities and Certificates of Deposit (Tables)

12 Months Ended

Dec. 31, 2018

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 December 31, 2018 and 2017 were as follows:

	December 31, 2018								December 31, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Securities Investments - Debt Securities	$	1,622	$	10	$	—	$	1,632	$	1,806	$	—	$	11	$	1,795
Securities Investments - Equity Securities	666		—		410		256		5,388		—		4,144		1,244
Debt Securities Carried by EGL	147,009		954		—		147,963		34,233		87		26		34,294
Investment Funds	56,296		402		1,922		54,776		22,027		5,678		6		27,699
Total	$	205,593	$	1,366	$	2,332	$	204,627	$	63,454	$	5,765	$	4,187	$	65,032

Investments Classified by Contractual Maturity Date

Scheduled maturities of the Company's available-for-sale debt securities within the Securities Investments portfolio as of December 31, 2018 and 2017 were as follows:

	December 31, 2018				December 31, 2017
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	391	$	391	$	204	$	204
Due after one year through five years	1,231		1,241		1,602		1,591
Total	$	1,622	$	1,632	$	1,806	$	1,795