Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

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- Definition

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.

+ References

No definition available.

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- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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-Paragraph 4B
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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
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- Definition

The number of derivative instruments of a particular group held by the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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- Definition

The percentage of ownership held in derivative instruments.

+ References

No definition available.

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Derivative Financial Instruments (Details) - Not designated as a hedge $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) contract	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Total return swap contracts
Derivative Financial Instruments
Number of contracts \| contract	3
Notional value	$ 153,100		$ 160,200
Cash collateral with the counterparties	5,400		7,100
Total return swap contracts \| Investment and other income (loss)
Derivative Financial Instruments
Net gains (losses) recognized in income	(11,045)	$ (15,222)
Total return swap contracts \| Other current liabilities
Derivative Financial Instruments
Fair value	$ 476		$ 475
Sponsored funds
Derivative Financial Instruments
Investment ownership interest (as a percent)	97.00%
Sponsored funds \| Total return swap contracts
Derivative Financial Instruments
Investment ownership interest (as a percent)	83.00%