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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Securities Loaned, Fair Value of Collateral	$ 102,208	$ 121,551
Securities Received as Collateral	112,000	128,000
Securities for Reverse Repurchase Agreements	385,391	413,819
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	397,712	417,550
Reported Value Measurement [Member]
Debt Securities, Available-for-sale [Line Items]
Securities Borrowed	350,350	358,875
Securities Loaned, Fair Value of Collateral	101,995	117,246
Estimate of Fair Value Measurement [Member]
Debt Securities, Available-for-sale [Line Items]
Securities Borrowed	365,730	377,820
Securities for Reverse Repurchase Agreements	$ 394,698	$ 428,344

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Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

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Fair value of the securities pledged as collateral against securities loaned.

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

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Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

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