Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Amortized Cost Basis	$ 96,454	$ 63,454
Marketable Securities, Accumulated Gross Unrealized Gain, before Tax	4,089	5,765
Marketable Securities, Accumulated Gross Unrealized Loss, before Tax	4,193	4,187
Marketable Securities	96,350	65,032
Securities Investments - Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4,683	1,806
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	13	11
Available-for-sale Securities	4,670	1,795
Securities Investments - Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Trading Securities, Cost	5,388	5,388
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	4,149	4,144
Trading Securities	1,239	1,244
Debt Securities Carried by EGL [Member]
Schedule of Available-for-sale Securities [Line Items]
Trading Securities, Cost	37,390	34,233
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	156	87
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	24	26
Trading Securities	37,522	34,294
investment Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Trading Securities, Cost	48,993	22,027
Trading Securities, Accumulated Gross Unrealized Gain, before Tax	3,933	5,678
Trading Securities, Accumulated Gross Unrealized Loss, before Tax	7	6
Trading Securities	$ 52,919	$ 27,699

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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 of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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