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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative Assets [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 310,405 | $ 238,804
Gross Amounts Offset in the Balance Sheet |  | (21,589) | (14,111)
Net Amounts Presented in the Balance Sheet |  | 288,816 | 224,693
Derivative Asset, Fair Value of Collateral | [1] | (19,127) | (20,260)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received | [2] | (260,135) | (178,141)
Net Amount |  | 9,554 | 26,292
Derivative Liabilities [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 60,542 | 56,665
Gross Amounts Offset in the Balance Sheet |  | (21,589) | (14,111)
Net Amounts Presented in the Balance Sheet |  | 38,953 | 42,554
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | [3] | (60,120) | (47,222)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received | [4] | (15,916) | 0
Net Amount |  | $ (37,083) | $ (4,668)
[1] | Consists of U.S. Treasury 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 securities.
[4] | Consists of receivable from counterparty, included in other assets.

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