Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities Investments
Cost	$ 52,211	$ 68,527
Gross Unrealized Gains	4,260	1,931
Gross Unrealized Losses	4,136	3,971
Fair Value	52,335	66,487
Securities Investments [Member]
Securities Investments
Cost	7,098	6,470
Gross Unrealized Gains	6	0
Gross Unrealized Losses	4,069	3,945
Fair Value	3,035	2,525
Debt Securities Carried by EGL [Member]
Securities Investments
Cost	22,806	38,392
Gross Unrealized Gains	87	77
Gross Unrealized Losses	1	15
Fair Value	22,892	38,454
Investment Funds [Member]
Securities Investments
Cost	22,307	23,665
Gross Unrealized Gains	4,167	1,854
Gross Unrealized Losses	66	11
Fair Value	$ 26,408	$ 25,508

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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