Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,836	$ 1,622
Debt Securities, Available-for-sale	1,858	1,632
Marketable Securities, Amortized Cost Basis	210,757	205,593
Marketable Securities, Accumulated Gross Unrealized Gain, before Tax	3,133	1,366
Marketable Securities, Accumulated Gross Unrealized Loss, before Tax	407	2,332
Marketable Securities	213,483	204,627
Securities Investments - Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,836	1,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	22	10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	1,858	1,632
Securities Investments - Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	666	666
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	259	410
Equity Securities, FV-NI	407	256
Debt Securities Carried by EGL [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	1,055	954
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	2	0
Debt Securities, Trading, Amortized Cost	145,349	147,009
Debt Securities, Trading	146,402	147,963
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	62,906	56,296
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	2,056	402
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	146	1,922
Equity Securities, FV-NI	$ 64,816	$ 54,776

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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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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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Amount of investment in marketable security.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amortized cost of investments in debt securities classified as trading.

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