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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
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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

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