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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
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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