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Disclosures About Offsetting Assets And Liabilities (Financial Liabilities And Derivative Liabilities That Are Subject To Offset) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Offsetting [Abstract] |  |  |
Gross amounts of recognized liabilities, Securities lending | [1] | $ (369,988) | $ (478,814)
Net amounts presented in the Statement of Financial Condition, Securities lending | [1] | (369,988) | (478,814)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending | [1] | 185,225 | 291,793
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending | [1] | 176,670 | 175,849
Securities lending, Net amount | [1] | (8,093) | (11,172)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell | [2] | (219,727) | (268,546)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell | [2] | (219,727) | (268,546)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell | [2] | 176,660 | 216,542
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell | [2] | 43,067 | 52,004
Gross amount of recognized liabilities, Cash flow interest rate contracts |  | (1,191) | (1,823)
Net amounts presented in the Statement of Financial Condition, Cash flow interest rate contracts |  | (1,191) | (1,823)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Cash flow interest rate contracts |  | 1,200 |
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Cash flow interest rate contracts |  | 1,191 | 1,823
Gross amounts of recognized liabilities |  | (590,906) | (749,183)
Net amounts presented in the Statement of Financial Condition |  | (590,906) | (749,183)
Gross amounts not offset in the Statement of Financial Position, Financial instruments |  | 361,885 | 508,335
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged |  | 220,928 | 229,676
Net amount |  | $ (8,093) | $ (11,172)
[1] | Securities lending transactions are included in payables to brokers, dealers, and clearing organizations on the consolidated statements of financial condition. See Note 3 in the notes to consolidated financial statements for additional information on payables to brokers, dealers, and clearing organizations.
[2] | Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default.

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