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Derivative Instruments (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Offsetting of Financial Assets, Derivatives    
Gross Amounts of Recognized Financial Instruments $ 4,847,794 $ 5,070,517
Gross Amounts Offset in the Statements of Financial Position (4,804,816) (4,919,486)
Net Amounts Presented in the Statements of Financial Position 42,978 151,031
Financial Instruments/Collateral 0 0
Net Amount 42,978 151,031
Securities purchased under agreement to resell    
Gross Amounts of Recognized Financial Instruments 675,000 0
Gross Amounts Offset in the Statements of Financial Position 0 0
Net Amounts Presented in the Statements of Financial Position 675,000 0
Financial Instruments/Collateral (675,000) 0
Net Amount 0 0
Total Assets    
Gross Amounts of Recognized Financial Instruments 5,522,794 5,070,517
Gross Amounts Offset in the Statements of Financial Position (4,804,816) (4,919,486)
Net Amounts Presented in the Statements of Financial Position 717,978 151,031
Financial Instruments/Collateral (675,000) 0
Net Amount 42,978 151,031
Offsetting of Financial Liabilities, Derivatives    
Gross Amounts of Recognized Financial Instruments 2,140,789 1,941,403
Gross Amounts Offset in the Statements of Financial Position (2,134,160) (1,941,403)
Net Amounts Presented in the Statements of Financial Position 6,629 0
Financial Instruments/Collateral (6,629) 0
Net Amount 0 0
Securities sold under agreement to repurchase    
Gross Amounts of Recognized Financial Instruments 0 0
Gross Amounts Offset in the Statements of Financial Position 0 0
Net Amounts Presented in the Statements of Financial Position 0 0
Financial Instruments/Collateral 0 0
Net Amount 0 0
Total Liabilities    
Gross Amounts of Recognized Financial Instruments 2,140,789 1,941,403
Gross Amounts Offset in the Statements of Financial Position (2,134,160) (1,941,403)
Net Amounts Presented in the Statements of Financial Position 6,629 0
Financial Instruments/Collateral (6,629) 0
Net Amount $ 0 $ 0