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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Derivative Assets [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 164,774 | $ 198,530
Gross Amounts Offset in the Balance Sheet |  | (17,560) | (20,258)
Net Amounts Presented in the Balance Sheet |  | 147,214 | 178,272
Derivative Asset, Fair Value of Collateral | [1] | 0 | (862)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received | [2] | (159,194) | (185,900)
Net Amount |  | (11,980) | (8,490)
Derivative Liabilities [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 31,492 | 44,499
Gross Amounts Offset in the Balance Sheet |  | (17,560) | (20,258)
Net Amounts Presented in the Balance Sheet |  | 13,932 | 24,241
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | [3] | (61,293) | (58,156)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received | [4] | (13,400) | (22,221)
Net Amount |  | $ (60,761) | $ (56,136)
[1] | Consists of U.S. Treasury and government securities.
[2] | Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[3] | Included in available-for-sale securities, primarily consists of U.S. Treasury and government agency securities.
[4] | Consists of receivable from counterparty, included in other assets.

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