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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative Assets [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 201,070 $ 247,069
Gross Amounts Offset in the Balance Sheet (26,831) (18,581)
Net Amounts Presented in the Balance Sheet 174,239 228,488
Derivative Asset, Fair Value of Collateral [1] 0 0
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received (189,265) (235,611)
Net Amount (15,026) (7,123)
Derivative Liabilities [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 72,747 46,030
Gross Amounts Offset in the Balance Sheet (26,831) (18,581)
Net Amounts Presented in the Balance Sheet 45,916 27,449
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments [1] (72,803) (71,376)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received (56,310) (24,080)
Net Amount $ (83,197) $ (68,007)
[1]
Includes initial margin posted to a central clearing partner.