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Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Marketable Securities, Amortized Cost Basis | $ 203,635 | $ 63,454
Marketable Securities, Accumulated Gross Unrealized Gain, before Tax | 7,875 | 5,765
Marketable Securities, Accumulated Gross Unrealized Loss, before Tax | 382 | 4,187
Marketable Securities | 211,128 | 65,032
Securities Investments - Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,298 | 1,806
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5 | 11
Available-for-sale Securities | 1,293 | 1,795
Securities Investments - Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [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 | 310 | 4,144
Trading Securities | 356 | 1,244
Debt Securities Carried by EGL [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost | 145,731 | 34,233
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 159 | 87
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 63 | 26
Trading Securities | 145,827 | 34,294
investment Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost | 55,940 | 22,027
Trading Securities, Accumulated Gross Unrealized Gain, before Tax | 7,716 | 5,678
Trading Securities, Accumulated Gross Unrealized Loss, before Tax | 4 | 6
Trading Securities | $ 63,652 | $ 27,699

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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