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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Assets [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Asset |  | $ 237,180 | $ 247,069
Gross Amounts Offset in the Balance Sheet |  | (43,461) | (18,581)
Net Amounts Presented in the Balance Sheet |  | 193,719 | 228,488
Derivative Asset, Fair Value of Collateral | [1] | 0 | 0
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received |  | (205,890) | (235,611)
Net Amount |  | (12,171) | (7,123)
Derivative Liabilities [Abstract] |  |  |
Derivative Fair Value Of Free Standing Derivative Liability |  | 91,551 | 46,030
Gross Amounts Offset in the Balance Sheet |  | (43,461) | (18,581)
Net Amounts Presented in the Balance Sheet |  | 48,090 | 27,449
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments | [1] | (81,090) | (71,376)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received |  | (60,080) | (24,080)
Net Amount |  | $ (93,080) | $ (68,007)
[1] | Includes initial margin posted to a central clearing partner.

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