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Investments (Loss) Gain on Securities, Net of Investment Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
(Loss) Gain on Securities [Line Items]
(Loss) Gain on Securities, Net		$ (815)	$ 2,234	$ (1,997)	$ 4,796
Investments - Consolidated Investment Companies [Member]
(Loss) Gain on Securities [Line Items]
Unrealized (Losses) Gains		(653)	389	(2,343)	1,096
Realized Gains	[1]	501	1,075	1,325	2,074
Realized Losses	[1]	(723)	(131)	(898)	(699)
(Loss) Gain on Securities, Net		(875)	1,333	(1,916)	2,471
Investments - affiliates and other [Member]
(Loss) Gain on Securities [Line Items]
Unrealized (Losses) Gains		9	11	(206)	271
Net Realized Gains Recognized on Securities Sold	[1]	51	890	125	2,054
(Loss) Gain on Securities, Net		$ 60	$ 901	$ (81)	$ 2,325
[1] Realized gains and losses are computed on a specific-identification basis.

X

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

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- Definition

The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(9)(a))
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Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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