Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,933	$ 1,622
Debt Securities, Available-for-sale	1,968	1,632
Marketable Securities, Amortized Cost Basis	212,562	205,593
Marketable Securities, Accumulated Gross Unrealized Gain, before Tax	4,705	1,366
Marketable Securities, Accumulated Gross Unrealized Loss, before Tax	218	2,332
Marketable Securities	217,049	204,627
Securities Investments - Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,933	1,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	35	10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	1,968	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	218	410
Equity Securities, FV-NI	448	256
Debt Securities Carried by EGL [Member]
Debt Securities, Available-for-sale [Line Items]
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	1,538	954
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Trading, Amortized Cost	148,179	147,009
Debt Securities, Trading	149,717	147,963
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Cost	61,784	56,296
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	3,132	402
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	0	1,922
Equity Securities, FV-NI	$ 64,916	$ 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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