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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
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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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