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Investments Gain on Securities, Net of Investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
(Loss) Gain on Investments [Line Items] |  |  |  |  |
(Loss) gain on securities, net | [1] | $ (5,264) |  | $ 4,972 | $ 16,986
Consolidated Investment Companies [Member] |  |  |  |  |
(Loss) Gain on Investments [Line Items] |  |  |  |  |
(Loss) gain on securities, net |  | (4,000) |  | (600) | 2,600
Trading Securities [Member] |  |  |  |  |
(Loss) Gain on Investments [Line Items] |  |  |  |  |
Unrealized (loss) gain on trading securities |  | (1,359) |  | (2,578) | 2,036
Realized gains | [2] | 910 |  | 4,514 | 1,306
Realized losses | [2] | (2,760) |  | (1,848) | (870)
Derivative [Member] |  |  |  |  |
(Loss) Gain on Investments [Line Items] |  |  |  |  |
Unrealized (loss) gain on derivatives | [3] | 119 |  | (147) | (49)
Realized gains | [2],[3] | 301 |  | 214 | 1,083
Realized losses | [2],[3] | (1,630) |  | (451) | (349)
Available-for-sale Securities [Member] |  |  |  |  |
(Loss) Gain on Investments [Line Items] |  |  |  |  |
Realized gains | [2] | 1,503 |  | 5,359 | 15,390
Realized losses | [2] | $ (2,348) | [4] | $ (91) | $ (1,561)
[1] | Amounts related to consolidated investment companies totaled $(4.0) million, $(0.6) million and $2.6 million for 2015, 2014 and 2013, respectively.
[2] | Realized gains and losses are computed on a specific-identification basis.
[3] | Amounts related to the settlement of economic derivatives held by certain consolidated sponsored products.
[4] | The losses for the year ended December 31, 2015 include an impairment of an available-for-sale security.

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- Definition 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 No definition available. + Details
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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 No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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