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Financing Arrangements, Portfolio Investments - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding repurchase agreement by contractual maturity	$ 1,543,577	$ 1,276,918
Within 30 days
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding repurchase agreement by contractual maturity	732,051	1,081,911
Over 30 days to 90 days
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding repurchase agreement by contractual maturity	677,906	95,007
Over 90 days
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding repurchase agreement by contractual maturity	$ 133,620	$ 100,000

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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