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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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
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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.

+ References

No definition available.

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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
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-Name Accounting Standards Codification
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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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		6 Months Ended
	Jun. 30, 2017 USD ($) contract	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) contract	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Total return swap contracts
Derivative Financial Instruments
Number of contracts \| contract	8		8
Notional value	$ 238,200		$ 238,200		$ 160,200
Cash collateral with the counterparties	8,300		8,300		7,100
Total return swap contracts \| Investment and other income (loss)
Derivative Financial Instruments
Net gains (losses) recognized in income	(7,421)	$ (6,707)	(18,466)	$ (21,929)
Total return swap contracts \| Other assets
Derivative Financial Instruments
Fair value - assets	$ 884		$ 884
Total return swap contracts \| Other current liabilities
Derivative Financial Instruments
Fair value - liabilities					$ (475)
Sponsored funds
Derivative Financial Instruments
Investment ownership interest (as a percent)			99.00%
Sponsored funds \| Total return swap contracts
Derivative Financial Instruments
Investment ownership interest (as a percent)			89.00%