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Financing Arrangements, Portfolio Investments - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding financing agreements	$ 1,179,961	$ 1,276,918
Within 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding financing agreements	441,200	1,081,911
Over 30 days to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding financing agreements	638,761	95,007
Over 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding financing agreements	$ 100,000	$ 100,000

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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