Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Amortized Cost Basis	$ 205,593	$ 63,454
Marketable Securities, Accumulated Gross Unrealized Gain, before Tax	1,366	5,765
Marketable Securities, Accumulated Gross Unrealized Loss, before Tax	2,332	4,187
Marketable Securities	204,627	65,032
Securities Investments - Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,622	1,806
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	10	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	11
Available-for-sale Securities	1,632	1,795
Securities Investments - Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Cost	666	5,388
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	410	4,144
Debt Securities, Trading, and Equity Securities, FV-NI	256	1,244
Debt Securities Carried by EGL [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Cost	147,009	34,233
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	954	87
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	26
Debt Securities, Trading, and Equity Securities, FV-NI	147,963	34,294
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Cost	56,296	22,027
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	402	5,678
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	1,922	6
Debt Securities, Trading, and Equity Securities, FV-NI	$ 54,776	$ 27,699

Marketable Securities, Accumulated Gross Unrealized Gain, before Tax

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Marketable Securities, Accumulated Gross Unrealized Loss, before Tax

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Marketable Securities, Amortized Cost Basis

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Trading Securities, Accumulated Gross Unrealized Gain, before Tax

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Trading Securities, Accumulated Gross Unrealized Loss, before Tax

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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
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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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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.

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Amount of investment in marketable security.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Cost of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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