Marketable Securities and Certificates of Deposit - Amortized Cost and Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities Investments
Marketable Securities, Cost	$ 63,454	$ 68,527
Marketable Securities, Gross Unrealized Gains	5,765	1,931
Marketable Securities, Gross Unrealized Losses	4,187	3,971
Marketable Securities, Fair Value	65,032	66,487
Securities Investments [Member]
Securities Investments
Available-for-sale Securities, Cost	7,194	6,470
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	4,155	3,945
Available-for-sale Securities, Fair Value	3,039	2,525
Debt Securities Carried by EGL [Member]
Securities Investments
Trading Securities, Cost	34,233	38,392
Trading Securities, Gross Unrealized Gains	87	77
Trading Securities, Gross Unrealized Losses	26	15
Trading Securities, Fair Value	34,294	38,454
Investment Funds [Member]
Securities Investments
Trading Securities, Cost	22,027	23,665
Trading Securities, Gross Unrealized Gains	5,678	1,854
Trading Securities, Gross Unrealized Losses	6	11
Trading Securities, Fair Value	$ 27,699	$ 25,508

Marketable Securities, Accumulated Gross Unrealized Gain, before Tax

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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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Trading Securities, Accumulated Gross Unrealized Loss, before Tax

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- Definition

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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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Cost of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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